JUCE/modules/juce_audio_basics/mpe/juce_MPEInstrument.cpp

/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2015 - ROLI Ltd.

   Permission is granted to use this software under the terms of either:
   a) the GPL v2 (or any later version)
   b) the Affero GPL v3

   Details of these licenses can be found at: www.gnu.org/licenses

   JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

   ------------------------------------------------------------------------------

   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.juce.com for more information.

  ==============================================================================
*/

namespace
{
    const uint8 noLSBValueReceived = 0xff;
    const Range<int> allChannels = Range<int> (1, 17);
}

//==============================================================================
MPEInstrument::MPEInstrument() noexcept
{
    std::fill_n (lastPressureLowerBitReceivedOnChannel, 16, noLSBValueReceived);
    std::fill_n (lastTimbreLowerBitReceivedOnChannel, 16, noLSBValueReceived);
    std::fill_n (isNoteChannelSustained, 16, false);

    pitchbendDimension.value = &MPENote::pitchbend;
    pressureDimension.value = &MPENote::pressure;
    timbreDimension.value = &MPENote::timbre;

    omniMode.isEnabled = false;
    omniMode.pitchbendRange = 2;
}

MPEInstrument::~MPEInstrument()
{
}

//==============================================================================
MPEZoneLayout MPEInstrument::getZoneLayout() const noexcept
{
    return zoneLayout;
}

void MPEInstrument::setZoneLayout (MPEZoneLayout newLayout)
{
    releaseAllNotes();

    const ScopedLock sl (lock);
    omniMode.isEnabled = false;
    zoneLayout = newLayout;
}

//==============================================================================
void MPEInstrument::enableOmniMode (int pitchbendRange)
{
    releaseAllNotes();

    const ScopedLock sl (lock);
    omniMode.isEnabled = true;
    omniMode.pitchbendRange = pitchbendRange;
    zoneLayout.clearAllZones();
}

bool MPEInstrument::isOmniModeEnabled() const noexcept
{
    return omniMode.isEnabled;
}

//==============================================================================
void MPEInstrument::setPressureTrackingMode (TrackingMode modeToUse)
{
    pressureDimension.trackingMode = modeToUse;
}

void MPEInstrument::setPitchbendTrackingMode (TrackingMode modeToUse)
{
    pitchbendDimension.trackingMode = modeToUse;
}

void MPEInstrument::setTimbreTrackingMode (TrackingMode modeToUse)
{
    timbreDimension.trackingMode = modeToUse;
}

//==============================================================================
void MPEInstrument::addListener (Listener* const listenerToAdd) noexcept
{
    listeners.add (listenerToAdd);
}

void MPEInstrument::removeListener (Listener* const listenerToRemove) noexcept
{
    listeners.remove (listenerToRemove);
}

MPEInstrument::Listener::Listener()
{
}

MPEInstrument::Listener::~Listener()
{
}

//==============================================================================
void MPEInstrument::processNextMidiEvent (const MidiMessage& message)
{
    zoneLayout.processNextMidiEvent (message);

    if (message.isNoteOn (true))           processMidiNoteOnMessage (message);
    else if (message.isNoteOff (false))    processMidiNoteOffMessage (message);
    else if (message.isAllNotesOff())      processMidiAllNotesOffMessage (message);
    else if (message.isPitchWheel())       processMidiPitchWheelMessage (message);
    else if (message.isChannelPressure())  processMidiChannelPressureMessage (message);
    else if (message.isController())       processMidiControllerMessage (message);
}

//==============================================================================
void MPEInstrument::processMidiNoteOnMessage (const MidiMessage& message)
{
    // Note: if a note-on with velocity = 0 is used to convey a note-off,
    // then the actual note-off velocity is not known. In this case,
    // the MPE convention is to use note-off velocity = 64.

    if (message.getVelocity() == 0)
    {
        noteOff (message.getChannel(),
                 message.getNoteNumber(),
                 MPEValue::from7BitInt (64));
    }
    else
    {
        noteOn (message.getChannel(),
                message.getNoteNumber(),
                MPEValue::from7BitInt (message.getVelocity()));
    }
}

//==============================================================================
void MPEInstrument::processMidiNoteOffMessage (const MidiMessage& message)
{
    noteOff (message.getChannel(),
             message.getNoteNumber(),
             MPEValue::from7BitInt (message.getVelocity()));
}

//==============================================================================
void MPEInstrument::processMidiPitchWheelMessage (const MidiMessage& message)
{
    pitchbend (message.getChannel(),
               MPEValue::from14BitInt (message.getPitchWheelValue()));
}

//==============================================================================
void MPEInstrument::processMidiChannelPressureMessage (const MidiMessage& message)
{
    pressure (message.getChannel(),
              MPEValue::from7BitInt (message.getChannelPressureValue()));
}

//==============================================================================
void MPEInstrument::processMidiControllerMessage (const MidiMessage& message)
{
    switch (message.getControllerNumber())
    {
        case 64:    sustainPedal      (message.getChannel(), message.isSustainPedalOn());   break;
        case 66:    sostenutoPedal    (message.getChannel(), message.isSostenutoPedalOn()); break;
        case 70:    handlePressureMSB (message.getChannel(), message.getControllerValue()); break;
        case 74:    handleTimbreMSB   (message.getChannel(), message.getControllerValue()); break;
        case 102:   handlePressureLSB (message.getChannel(), message.getControllerValue()); break;
        case 106:   handleTimbreLSB   (message.getChannel(), message.getControllerValue()); break;
        default:    break;
    }
}

//==============================================================================
void MPEInstrument::processMidiAllNotesOffMessage (const MidiMessage& message)
{
    if (omniMode.isEnabled)
    {
        for (int i = notes.size(); --i >= 0;)
        {
            MPENote& note = notes.getReference (i);

            if (note.midiChannel == message.getChannel())
            {
                note.keyState = MPENote::off;
                note.noteOffVelocity = MPEValue::from7BitInt (64); // some reasonable number
                listeners.call (&MPEInstrument::Listener::noteReleased, note);
                notes.remove (i);
            }
        }
    }
    else if (MPEZone* zone = zoneLayout.getZoneByMasterChannel (message.getChannel()))
    {
        for (int i = notes.size(); --i >= 0;)
        {
            MPENote& note = notes.getReference (i);

            if (zone->isUsingChannelAsNoteChannel (note.midiChannel))
            {
                note.keyState = MPENote::off;
                note.noteOffVelocity = MPEValue::from7BitInt (64); // some reasonable number
                listeners.call (&MPEInstrument::Listener::noteReleased, note);
                notes.remove (i);
            }
        }
    }
}

//==============================================================================
void MPEInstrument::handlePressureMSB (int midiChannel, int value) noexcept
{
    const uint8 lsb = lastPressureLowerBitReceivedOnChannel[midiChannel - 1];

    pressure (midiChannel, lsb == noLSBValueReceived ? MPEValue::from7BitInt (value)
                                                     : MPEValue::from14BitInt (lsb + (value << 7)));
}

void MPEInstrument::handlePressureLSB (int midiChannel, int value) noexcept
{
    lastPressureLowerBitReceivedOnChannel[midiChannel - 1] = uint8 (value);
}

void MPEInstrument::handleTimbreMSB (int midiChannel, int value) noexcept
{
    const uint8 lsb = lastTimbreLowerBitReceivedOnChannel[midiChannel - 1];

    timbre (midiChannel, lsb == noLSBValueReceived ? MPEValue::from7BitInt (value)
                                                   : MPEValue::from14BitInt (lsb + (value << 7)));
}

void MPEInstrument::handleTimbreLSB (int midiChannel, int value) noexcept
{
    lastTimbreLowerBitReceivedOnChannel[midiChannel - 1] = uint8 (value);
}

//==============================================================================
MPEValue MPEInstrument::getInitialPitchbendForNoteOn (int midiChannel, int /*midiNoteNumber*/, MPEValue /*midiNoteOnVelocity*/) const
{
    return pitchbendDimension.lastValueReceivedOnChannel[midiChannel - 1];
}

MPEValue MPEInstrument::getInitialPressureForNoteOn (int /*midiChannel*/, int /*midiNoteNumber*/, MPEValue midiNoteOnVelocity) const
{
    return midiNoteOnVelocity;
}

MPEValue MPEInstrument::getInitialTimbreForNoteOn (int midiChannel, int /*midiNoteNumber*/, MPEValue /*midiNoteOnVelocity*/) const
{
    return timbreDimension.lastValueReceivedOnChannel[midiChannel - 1];
}

//==============================================================================
void MPEInstrument::noteOn (int midiChannel,
                            int midiNoteNumber,
                            MPEValue midiNoteOnVelocity)
{
    if (! isNoteChannel (midiChannel) && ! omniMode.isEnabled)
        return;

    MPENote newNote (midiChannel,
                     midiNoteNumber,
                     midiNoteOnVelocity,
                     getInitialPitchbendForNoteOn (midiChannel, midiNoteNumber, midiNoteOnVelocity),
                     getInitialPressureForNoteOn (midiChannel, midiNoteNumber, midiNoteOnVelocity),
                     getInitialTimbreForNoteOn (midiChannel, midiNoteNumber, midiNoteOnVelocity),
                     isNoteChannelSustained[midiChannel - 1] ? MPENote::keyDownAndSustained : MPENote::keyDown);

    const ScopedLock sl (lock);
    updateNoteTotalPitchbend (newNote);

    if (MPENote* alreadyPlayingNote = getNotePtr (midiChannel, midiNoteNumber))
    {
        // pathological case: second note-on received for same note -> retrigger it
        alreadyPlayingNote->keyState = MPENote::off;
        alreadyPlayingNote->noteOffVelocity = MPEValue::from7BitInt (64); // some reasonable number
        listeners.call (&MPEInstrument::Listener::noteReleased, *alreadyPlayingNote);
        notes.remove (alreadyPlayingNote);
    }

    notes.add (newNote);
    listeners.call (&MPEInstrument::Listener::noteAdded, newNote);
}

//==============================================================================
void MPEInstrument::noteOff (int midiChannel,
                             int midiNoteNumber,
                             MPEValue midiNoteOffVelocity)
{
    if (notes.empty() || (! isNoteChannel (midiChannel) && ! omniMode.isEnabled))
        return;

    const ScopedLock sl (lock);

    if (MPENote* note = getNotePtr (midiChannel, midiNoteNumber))
    {
        note->keyState = (note->keyState == MPENote::keyDownAndSustained) ? MPENote::sustained : MPENote::off;
        note->noteOffVelocity = midiNoteOffVelocity;

        // last pitchbend and timbre values received for this note should not be re-used for
        // any new notes, so reset them:
        pitchbendDimension.lastValueReceivedOnChannel[midiChannel - 1] = MPEValue();
        timbreDimension.lastValueReceivedOnChannel[midiChannel - 1] = MPEValue();

        if (note->keyState == MPENote::off)
        {
            listeners.call (&MPEInstrument::Listener::noteReleased, *note);
            notes.remove (note);
        }
        else
        {
            listeners.call (&MPEInstrument::Listener::noteKeyStateChanged, *note);
        }
    }
}

//==============================================================================
void MPEInstrument::pitchbend (int midiChannel, MPEValue value)
{
    const ScopedLock sl (lock);
    updateDimension (midiChannel, pitchbendDimension, value);
}

void MPEInstrument::pressure (int midiChannel, MPEValue value)
{
    const ScopedLock sl (lock);
    updateDimension (midiChannel, pressureDimension, value);
}

void MPEInstrument::timbre (int midiChannel, MPEValue value)
{
    const ScopedLock sl (lock);
    updateDimension (midiChannel, timbreDimension, value);
}

//==============================================================================
void MPEInstrument::updateDimension (int midiChannel, MPEDimension& dimension, MPEValue value)
{
    dimension.lastValueReceivedOnChannel[midiChannel - 1] = value;

    if (notes.empty())
        return;

    if (MPEZone* zone = zoneLayout.getZoneByMasterChannel (midiChannel))
    {
        updateDimensionMaster (*zone, dimension, value);
    }
    else if (isNoteChannel (midiChannel) || omniMode.isEnabled)
    {
        if (dimension.trackingMode == allNotesOnChannel)
        {
            for (int i = notes.size(); --i >= 0;)
            {
                MPENote& note = notes.getReference (i);

                if (note.midiChannel == midiChannel)
                    updateDimensionForNote (note, dimension, value);
            }
        }
        else
        {
            if (MPENote* note = getNotePtr (midiChannel, dimension.trackingMode))
                updateDimensionForNote (*note, dimension, value);
        }
    }
}

//==============================================================================
void MPEInstrument::updateDimensionMaster (MPEZone& zone, MPEDimension& dimension, MPEValue value)
{
    const Range<int> channels (zone.getNoteChannelRange());

    for (int i = notes.size(); --i >= 0;)
    {
        MPENote& note = notes.getReference (i);

        if (! channels.contains (note.midiChannel))
            continue;

        if (&dimension == &pitchbendDimension)
        {
            // master pitchbend is a special case: we don't change the note's own pitchbend,
            // instead we have to update its total (master + note) pitchbend.
            updateNoteTotalPitchbend (note);
            listeners.call (&MPEInstrument::Listener::notePitchbendChanged, note);
        }
        else if (dimension.getValue (note) != value)
        {
            dimension.getValue (note) = value;
            callListenersDimensionChanged (note, dimension);
        }
    }
}

//==============================================================================
void MPEInstrument::updateDimensionForNote (MPENote& note, MPEDimension& dimension, MPEValue value)
{
    if (dimension.getValue (note) != value)
    {
        dimension.getValue (note) = value;

        if (&dimension == &pitchbendDimension)
            updateNoteTotalPitchbend (note);

        callListenersDimensionChanged (note, dimension);
    }
}

//==============================================================================
void MPEInstrument::callListenersDimensionChanged (MPENote& note, MPEDimension& dimension)
{
    if (&dimension == &pressureDimension)  { listeners.call (&MPEInstrument::Listener::notePressureChanged,  note); return; }
    if (&dimension == &timbreDimension)    { listeners.call (&MPEInstrument::Listener::noteTimbreChanged,    note); return; }
    if (&dimension == &pitchbendDimension) { listeners.call (&MPEInstrument::Listener::notePitchbendChanged, note); return; }
}

//==============================================================================
void MPEInstrument::updateNoteTotalPitchbend (MPENote& note)
{
    if (omniMode.isEnabled)
    {
        note.totalPitchbendInSemitones = note.pitchbend.asSignedFloat() * omniMode.pitchbendRange;
    }
    else
    {
        if (MPEZone* zone = zoneLayout.getZoneByNoteChannel (note.midiChannel))
        {
            double notePitchbendInSemitones = note.pitchbend.asSignedFloat() * zone->getPerNotePitchbendRange();
            double masterPitchbendInSemitones = pitchbendDimension.lastValueReceivedOnChannel[zone->getMasterChannel() - 1].asSignedFloat() * zone->getMasterPitchbendRange();
            note.totalPitchbendInSemitones = notePitchbendInSemitones + masterPitchbendInSemitones;
        }
        else
        {
            // oops - this note seems to not belong to any zone!
            jassertfalse;
        }
    }
}

//==============================================================================
void MPEInstrument::sustainPedal (int midiChannel, bool isDown)
{
    const ScopedLock sl (lock);
    handleSustainOrSostenuto (midiChannel, isDown, false);
}

void MPEInstrument::sostenutoPedal (int midiChannel, bool isDown)
{
    const ScopedLock sl (lock);
    handleSustainOrSostenuto (midiChannel, isDown, true);
}

//==============================================================================
void MPEInstrument::handleSustainOrSostenuto (int midiChannel, bool isDown, bool isSostenuto)
{
    MPEZone* affectedZone = zoneLayout.getZoneByMasterChannel (midiChannel);

    if (affectedZone == nullptr && ! omniMode.isEnabled)
        return;

    for (int i = notes.size(); --i >= 0;)
    {
        MPENote& note = notes.getReference (i);

        if ((omniMode.isEnabled
             || note.midiChannel == midiChannel)
             || affectedZone->isUsingChannel (note.midiChannel))
        {
            if (note.keyState == MPENote::keyDown && isDown)
                note.keyState = MPENote::keyDownAndSustained;
            else if (note.keyState == MPENote::sustained && ! isDown)
                note.keyState = MPENote::off;
            else if (note.keyState == MPENote::keyDownAndSustained && ! isDown)
                note.keyState = MPENote::keyDown;

            if (note.keyState == MPENote::off)
            {
                listeners.call (&MPEInstrument::Listener::noteReleased, note);
                notes.remove (i);
            }
            else
            {
                listeners.call (&MPEInstrument::Listener::noteKeyStateChanged, note);
            }
        }
    }

    if (! isSostenuto)
    {
        if (omniMode.isEnabled)
            isNoteChannelSustained[midiChannel - 1] = isDown;
        else
            for (int i = affectedZone->getFirstNoteChannel(); i <= affectedZone->getLastNoteChannel(); ++i)
                isNoteChannelSustained[i - 1] = isDown;
    }
}

//==============================================================================
bool MPEInstrument::isNoteChannel (int midiChannel) const noexcept
{
    return zoneLayout.getZoneByNoteChannel (midiChannel) != nullptr;
}

bool MPEInstrument::isMasterChannel (int midiChannel) const noexcept
{
    return zoneLayout.getZoneByMasterChannel (midiChannel) != nullptr;
}

//==============================================================================
int MPEInstrument::getNumPlayingNotes() const noexcept
{
    return notes.size();
}

MPENote MPEInstrument::getNote (int midiChannel, int midiNoteNumber) const noexcept
{
    if (MPENote* note = getNotePtr (midiChannel, midiNoteNumber))
        return *note;

    return MPENote();
}

MPENote MPEInstrument::getNote (int index) const noexcept
{
    return notes[index];
}

//==============================================================================
MPENote MPEInstrument::getMostRecentNote (int midiChannel) const noexcept
{
    if (MPENote* note = getLastNotePlayedPtr (midiChannel))
        return *note;

    return MPENote();
}

MPENote MPEInstrument::getMostRecentNoteOtherThan (MPENote otherThanThisNote) const noexcept
{
    for (int i = notes.size(); --i >= 0;)
    {
        const MPENote& note = notes.getReference (i);

        if (note != otherThanThisNote)
            return note;
    }

    return MPENote();
}

//==============================================================================
MPENote* MPEInstrument::getNotePtr (int midiChannel, int midiNoteNumber) const noexcept
{
    for (int i = 0; i < notes.size(); ++i)
    {
        MPENote& note = notes.getReference (i);

        if (note.midiChannel == midiChannel && note.initialNote == midiNoteNumber)
            return &note;
    }

    return nullptr;
}

//==============================================================================
MPENote* MPEInstrument::getNotePtr (int midiChannel, TrackingMode mode) const noexcept
{
    // for the "all notes" tracking mode, this method can never possibly
    // work because it returns 0 or 1 note but there might be more than one!
    jassert (mode != allNotesOnChannel);

    if (mode == lastNotePlayedOnChannel)  return getLastNotePlayedPtr (midiChannel);
    if (mode == lowestNoteOnChannel)      return getLowestNotePtr (midiChannel);
    if (mode == highestNoteOnChannel)     return getHighestNotePtr (midiChannel);

    return nullptr;
}

//==============================================================================
MPENote* MPEInstrument::getLastNotePlayedPtr (int midiChannel) const noexcept
{
    for (int i = notes.size(); --i >= 0;)
    {
        MPENote& note = notes.getReference (i);

        if (note.midiChannel == midiChannel
             && (note.keyState == MPENote::keyDown || note.keyState == MPENote::keyDownAndSustained))
            return &note;
    }

    return nullptr;
}

//==============================================================================
MPENote* MPEInstrument::getHighestNotePtr (int midiChannel) const noexcept
{
    int initialNoteMax = -1;
    MPENote* result = nullptr;

    for (int i = notes.size(); --i >= 0;)
    {
        MPENote& note = notes.getReference (i);

        if (note.midiChannel == midiChannel
             && (note.keyState == MPENote::keyDown || note.keyState == MPENote::keyDownAndSustained)
             && note.initialNote > initialNoteMax)
        {
            result = &note;
            initialNoteMax = note.initialNote;
        }
    }

    return result;
}

MPENote* MPEInstrument::getLowestNotePtr (int midiChannel) const noexcept
{
    int initialNoteMin = 128;
    MPENote* result = nullptr;

    for (int i = notes.size(); --i >= 0;)
    {
        MPENote& note = notes.getReference (i);

        if (note.midiChannel == midiChannel
             && (note.keyState == MPENote::keyDown || note.keyState == MPENote::keyDownAndSustained)
             && note.initialNote < initialNoteMin)
        {
            result = &note;
            initialNoteMin = note.initialNote;
        }
    }

    return result;
}

//==============================================================================
void MPEInstrument::releaseAllNotes()
{
    const ScopedLock sl (lock);

    for (int i = notes.size(); --i >= 0;)
    {
        MPENote& note = notes.getReference (i);
        note.keyState = MPENote::off;
        note.noteOffVelocity = MPEValue::from7BitInt (64); // some reasonable number
        listeners.call (&MPEInstrument::Listener::noteReleased, note);
    }

    notes.clear();
}

//==============================================================================
//==============================================================================
#if JUCE_UNIT_TESTS

class MPEInstrumentTests : public UnitTest
{
public:
    MPEInstrumentTests()
        : UnitTest ("MPEInstrument class")
    {
        // using two MPE zones with the following layout for testing
        //
        // 1   2   3   4   5   6   7   8   9   10  11  12  13  14  15  16
        //     * ...................|      * ........................|

        testLayout.addZone (MPEZone (2, 5));
        testLayout.addZone (MPEZone (9, 6));
    }

    void runTest() override
    {
        beginTest ("initial zone layout");
        {
            MPEInstrument test;
            expectEquals (test.getZoneLayout().getNumZones(), 0);
        }

        beginTest ("get/setZoneLayout");
        {
            MPEInstrument test;
            test.setZoneLayout (testLayout);

            MPEZoneLayout newLayout = test.getZoneLayout();
            expectEquals (newLayout.getNumZones(), 2);
            expectEquals (newLayout.getZoneByIndex (0)->getMasterChannel(), 2);
            expectEquals (newLayout.getZoneByIndex (0)->getNumNoteChannels(), 5);
            expectEquals (newLayout.getZoneByIndex (1)->getMasterChannel(), 9);
            expectEquals (newLayout.getZoneByIndex (1)->getNumNoteChannels(), 6);
        }

        beginTest ("noteOn / noteOff");
        {
            {
                MPEInstrument test;
                test.setZoneLayout (testLayout);
                expectEquals (test.getNumPlayingNotes(), 0);
            }
            {
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                // note-on on master channel - ignore
                test.noteOn (9, 60, MPEValue::from7BitInt (100));
                expectEquals (test.getNumPlayingNotes(), 0);
                expectEquals (test.noteAddedCallCounter, 0);

                // note-on on any other channel - ignore
                test.noteOn (1, 60, MPEValue::from7BitInt (100));
                expectEquals (test.getNumPlayingNotes(), 0);
                expectEquals (test.noteAddedCallCounter, 0);

                // note-on on note channel - create new note
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                expectEquals (test.getNumPlayingNotes(), 1);
                expectEquals (test.noteAddedCallCounter, 1);
                expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);

                // note-off
                test.noteOff (3, 60, MPEValue::from7BitInt (33));
                expectEquals (test.getNumPlayingNotes(), 0);
                expectEquals (test.noteReleasedCallCounter, 1);
                expectHasFinishedNote (test, 3, 60, 33);
            }
            {
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);
                test.noteOn (3, 60, MPEValue::from7BitInt (100));

                // note off with non-matching note number shouldn't do anything
                test.noteOff (3, 61, MPEValue::from7BitInt (33));
                expectEquals (test.getNumPlayingNotes(), 1);
                expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectEquals (test.noteReleasedCallCounter, 0);

                // note off with non-matching midi channel shouldn't do anything
                test.noteOff (2, 60, MPEValue::from7BitInt (33));
                expectEquals (test.getNumPlayingNotes(), 1);
                expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectEquals (test.noteReleasedCallCounter, 0);
            }
            {
                // can have multiple notes on the same channel
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);
                test.noteOn (3, 0, MPEValue::from7BitInt (100));
                test.noteOn (3, 1, MPEValue::from7BitInt (100));
                test.noteOn (3, 2, MPEValue::from7BitInt (100));
                expectEquals (test.getNumPlayingNotes(), 3);
                expectNote (test.getNote (3, 0), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 1), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 2), 100, 100, 8192, 64, MPENote::keyDown);
            }
            {
                // pathological case: second note-on for same note should retrigger it.
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);
                test.noteOn (3, 0, MPEValue::from7BitInt (100));
                test.noteOn (3, 0, MPEValue::from7BitInt (60));
                expectEquals (test.getNumPlayingNotes(), 1);
                expectNote (test.getNote (3, 0), 60, 60, 8192, 64, MPENote::keyDown);
            }
        }

        beginTest ("noteReleased after setZoneLayout");
        {
            UnitTestInstrument test;
            test.setZoneLayout (testLayout);

            test.noteOn (3, 60, MPEValue::from7BitInt (100));
            test.noteOn (3, 61, MPEValue::from7BitInt (100));
            test.noteOn (4, 61, MPEValue::from7BitInt (100));
            expectEquals (test.getNumPlayingNotes(), 3);
            expectEquals (test.noteReleasedCallCounter, 0);

            test.setZoneLayout (testLayout);
            expectEquals (test.getNumPlayingNotes(), 0);
            expectEquals (test.noteReleasedCallCounter, 3);
        }

        beginTest ("releaseAllNotes");
        {
            UnitTestInstrument test;
            test.setZoneLayout (testLayout);
            test.noteOn (3, 60, MPEValue::from7BitInt (100));
            test.noteOn (4, 61, MPEValue::from7BitInt (100));
            test.noteOn (15, 62, MPEValue::from7BitInt (100));
            expectEquals (test.getNumPlayingNotes(), 3);

            test.releaseAllNotes();
            expectEquals (test.getNumPlayingNotes(), 0);
        }

        beginTest ("sustainPedal");
        {
            UnitTestInstrument test;
            test.setZoneLayout (testLayout);
            test.noteOn (3, 60, MPEValue::from7BitInt (100));  // note in Zone 1
            test.noteOn (10, 60, MPEValue::from7BitInt (100));  // note in Zone 2

            // sustain pedal on per-note channel shouldn't do anything.
            test.sustainPedal (3, true);
            expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);


            expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);
            expectNote (test.getNote (10, 60), 100, 100, 8192, 64, MPENote::keyDown);
            expectEquals (test.noteKeyStateChangedCallCounter, 0);

            // sustain pedal on non-zone channel shouldn't do anything either.
            test.sustainPedal (1, true);
            expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);
            expectNote (test.getNote (10, 60), 100, 100, 8192, 64, MPENote::keyDown);
            expectEquals (test.noteKeyStateChangedCallCounter, 0);

            // sustain pedal on master channel should sustain notes on *that* zone.
            test.sustainPedal (2, true);
            expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDownAndSustained);
            expectNote (test.getNote (10, 60), 100, 100, 8192, 64, MPENote::keyDown);
            expectEquals (test.noteKeyStateChangedCallCounter, 1);

            // release
            test.sustainPedal (2, false);
            expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);
            expectNote (test.getNote (10, 60), 100, 100, 8192, 64, MPENote::keyDown);
            expectEquals (test.noteKeyStateChangedCallCounter, 2);

            // should also sustain new notes added after the press
            test.sustainPedal (2, true);
            expectEquals (test.noteKeyStateChangedCallCounter, 3);
            test.noteOn (4, 51, MPEValue::from7BitInt (100));
            expectNote (test.getNote (4, 51), 100, 100, 8192, 64, MPENote::keyDownAndSustained);
            expectEquals (test.noteKeyStateChangedCallCounter, 3);

            // ...but only if that sustain came on the master channel of that zone!
            test.sustainPedal (11, true);
            test.noteOn (11, 52, MPEValue::from7BitInt (100));
            expectNote (test.getNote (11, 52), 100, 100, 8192, 64, MPENote::keyDown);
            test.noteOff (11, 52, MPEValue::from7BitInt (100));
            expectEquals (test.noteReleasedCallCounter, 1);

            // note-off should not turn off sustained notes inside the same zone
            test.noteOff (3, 60, MPEValue::from7BitInt (100));
            test.noteOff (4, 51, MPEValue::from7BitInt (100));
            test.noteOff (10, 60, MPEValue::from7BitInt (100)); // not affected!
            expectEquals (test.getNumPlayingNotes(), 2);
            expectEquals (test.noteReleasedCallCounter, 2);
            expectEquals (test.noteKeyStateChangedCallCounter, 5);
            expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::sustained);
            expectNote (test.getNote (4, 51), 100, 100, 8192, 64, MPENote::sustained);

            // notes should be turned off when pedal is released
            test.sustainPedal (2, false);
            expectEquals (test.getNumPlayingNotes(), 0);
            expectEquals (test.noteReleasedCallCounter, 4);
        }

        beginTest ("sostenutoPedal");
        {
            UnitTestInstrument test;
            test.setZoneLayout (testLayout);
            test.noteOn (3, 60, MPEValue::from7BitInt (100));  // note in Zone 1
            test.noteOn (10, 60, MPEValue::from7BitInt (100));  // note in Zone 2

            // sostenuto pedal on per-note channel shouldn't do anything.
            test.sostenutoPedal (3, true);
            expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);
            expectNote (test.getNote (10, 60), 100, 100, 8192, 64, MPENote::keyDown);
            expectEquals (test.noteKeyStateChangedCallCounter, 0);

            // sostenuto pedal on non-zone channel shouldn't do anything either.
            test.sostenutoPedal (1, true);
            expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);
            expectNote (test.getNote (10, 60), 100, 100, 8192, 64, MPENote::keyDown);
            expectEquals (test.noteKeyStateChangedCallCounter, 0);

            // sostenuto pedal on master channel should sustain notes on *that* zone.
            test.sostenutoPedal (2, true);
            expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDownAndSustained);
            expectNote (test.getNote (10, 60), 100, 100, 8192, 64, MPENote::keyDown);
            expectEquals (test.noteKeyStateChangedCallCounter, 1);

            // release
            test.sostenutoPedal (2, false);
            expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);
            expectNote (test.getNote (10, 60), 100, 100, 8192, 64, MPENote::keyDown);
            expectEquals (test.noteKeyStateChangedCallCounter, 2);

            // should only sustain notes turned on *before* the press (difference to sustain pedal)
            test.sostenutoPedal (2, true);
            expectEquals (test.noteKeyStateChangedCallCounter, 3);
            test.noteOn (4, 51, MPEValue::from7BitInt (100));
            expectEquals (test.getNumPlayingNotes(), 3);
            expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDownAndSustained);
            expectNote (test.getNote (4, 51), 100, 100, 8192, 64, MPENote::keyDown);
            expectNote (test.getNote (10, 60), 100, 100, 8192, 64, MPENote::keyDown);
            expectEquals (test.noteKeyStateChangedCallCounter, 3);

            // note-off should not turn off sustained notes inside the same zone,
            // but only if they were turned on *before* the sostenuto pedal (difference to sustain pedal)
            test.noteOff (3, 60, MPEValue::from7BitInt (100));
            test.noteOff (4, 51, MPEValue::from7BitInt (100));
            test.noteOff (10, 60, MPEValue::from7BitInt (100)); // not affected!
            expectEquals (test.getNumPlayingNotes(), 1);
            expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::sustained);
            expectEquals (test.noteReleasedCallCounter, 2);
            expectEquals (test.noteKeyStateChangedCallCounter, 4);

            // notes should be turned off when pedal is released
            test.sustainPedal (2, false);
            expectEquals (test.getNumPlayingNotes(), 0);
            expectEquals (test.noteReleasedCallCounter, 3);
        }

        beginTest ("getMostRecentNote");
        {
            MPEInstrument test;
            test.setZoneLayout (testLayout);

            test.noteOn (3, 60, MPEValue::from7BitInt (100));
            test.noteOn (3, 61, MPEValue::from7BitInt (100));

            {
                MPENote note = test.getMostRecentNote (2);
                expect (! note.isValid());
            }
            {
                MPENote note = test.getMostRecentNote (3);
                expect (note.isValid());
                expectEquals (int (note.midiChannel), 3);
                expectEquals (int (note.initialNote), 61);
            }

            test.sustainPedal (2, true);
            test.noteOff (3, 61, MPEValue::from7BitInt (100));

            {
                MPENote note = test.getMostRecentNote (3);
                expect (note.isValid());
                expectEquals (int (note.midiChannel), 3);
                expectEquals (int (note.initialNote), 60);
            }

            test.sustainPedal (2, false);
            test.noteOff (3, 60, MPEValue::from7BitInt (100));

            {
                MPENote note = test.getMostRecentNote (3);
                expect (! note.isValid());
            }
        }

        beginTest ("getMostRecentNoteOtherThan");
        {
            MPENote testNote (3, 60,
                              MPEValue::centreValue(), MPEValue::centreValue(),
                              MPEValue::centreValue(), MPEValue::centreValue());

            {
                // case 1: the note to exclude is not the most recent one.

                MPEInstrument test;
                test.setZoneLayout (testLayout);
                expect (! test.getMostRecentNoteOtherThan (testNote).isValid());

                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                expect (! test.getMostRecentNoteOtherThan (testNote).isValid());

                test.noteOn (4, 61, MPEValue::from7BitInt (100));
                expect (test.getMostRecentNoteOtherThan (testNote).isValid());
                expect (test.getMostRecentNoteOtherThan (testNote).midiChannel == 4);
                expect (test.getMostRecentNoteOtherThan (testNote).initialNote == 61);
            }
            {
                // case 2: the note to exclude is the most recent one.

                MPEInstrument test;
                test.setZoneLayout (testLayout);
                expect (! test.getMostRecentNoteOtherThan (testNote).isValid());

                test.noteOn (4, 61, MPEValue::from7BitInt (100));
                expect (test.getMostRecentNoteOtherThan (testNote).isValid());
                expect (test.getMostRecentNoteOtherThan (testNote).midiChannel == 4);
                expect (test.getMostRecentNoteOtherThan (testNote).initialNote == 61);

                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                expect (test.getMostRecentNoteOtherThan (testNote).isValid());
                expect (test.getMostRecentNoteOtherThan (testNote).midiChannel == 4);
                expect (test.getMostRecentNoteOtherThan (testNote).initialNote == 61);
            }
        }

        beginTest ("pressure");
        {
            {
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (4, 60, MPEValue::from7BitInt (100));
                test.noteOn (10, 60, MPEValue::from7BitInt (100));

                // applying pressure on a per-note channel should modulate one note
                test.pressure (3, MPEValue::from7BitInt (33));
                expectNote (test.getNote (3, 60), 100, 33, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (4, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (10, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectEquals (test.notePressureChangedCallCounter, 1);

                // applying pressure on a master channel should modulate all notes in this zone
                test.pressure (2, MPEValue::from7BitInt (44));
                expectNote (test.getNote (3, 60), 100, 44, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (4, 60), 100, 44, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (10, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectEquals (test.notePressureChangedCallCounter, 3);

                // applying pressure on an unrelated channel should be ignored
                test.pressure (1, MPEValue::from7BitInt (55));
                expectNote (test.getNote (3, 60), 100, 44, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (4, 60), 100, 44, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (10, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectEquals (test.notePressureChangedCallCounter, 3);
            }
            {
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                // two notes on same channel - only last added should be modulated
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (3, 61, MPEValue::from7BitInt (100));
                test.pressure (3, MPEValue::from7BitInt (66));
                expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 61), 100, 66, 8192, 64, MPENote::keyDown);
                expectEquals (test.notePressureChangedCallCounter, 1);
            }
            {
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                // edge case: two notes on same channel, one gets released,
                // then the other should be modulated
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (3, 61, MPEValue::from7BitInt (100));
                test.noteOff (3, 61, MPEValue::from7BitInt (100));
                test.pressure (3, MPEValue::from7BitInt (77));
                expectEquals (test.getNumPlayingNotes(), 1);
                expectNote (test.getNote (3, 60), 100, 77, 8192, 64, MPENote::keyDown);
                expectEquals (test.notePressureChangedCallCounter, 1);
            }
        }

        beginTest ("pitchbend");
        {
            {
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (4, 60, MPEValue::from7BitInt (100));
                test.noteOn (10, 60, MPEValue::from7BitInt (100));

                // applying pitchbend on a per-note channel should modulate one note
                test.pitchbend (3, MPEValue::from14BitInt (1111));
                expectNote (test.getNote (3, 60), 100, 100, 1111, 64, MPENote::keyDown);
                expectNote (test.getNote (4, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (10, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectEquals (test.notePitchbendChangedCallCounter, 1);

                // applying pitchbend on a master channel should be ignored for the
                // value of per-note pitchbend. Tests covering master pitchbend below.
                // Note: noteChanged will be called anyway for notes in that zone
                // because the total pitchbend for those notes has changed
                test.pitchbend (2, MPEValue::from14BitInt (2222));
                expectNote (test.getNote (3, 60), 100, 100, 1111, 64, MPENote::keyDown);
                expectNote (test.getNote (4, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (10, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectEquals (test.notePitchbendChangedCallCounter, 3);

                // applying pitchbend on an unrelated channel should do nothing.
                test.pitchbend (1, MPEValue::from14BitInt (3333));
                expectNote (test.getNote (3, 60), 100, 100, 1111, 64, MPENote::keyDown);
                expectNote (test.getNote (4, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (10, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectEquals (test.notePitchbendChangedCallCounter, 3);
            }
            {
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                // two notes on same channel - only last added should be bent
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (3, 61, MPEValue::from7BitInt (100));
                test.pitchbend (3, MPEValue::from14BitInt (4444));
                expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 61), 100, 100, 4444, 64, MPENote::keyDown);
                expectEquals (test.notePitchbendChangedCallCounter, 1);
            }
            {
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                // edge case: two notes on same channel, one gets released,
                // then the other should be bent
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (3, 61, MPEValue::from7BitInt (100));
                test.noteOff (3, 61, MPEValue::from7BitInt (100));
                test.pitchbend (3, MPEValue::from14BitInt (5555));
                expectEquals (test.getNumPlayingNotes(), 1);
                expectNote (test.getNote (3, 60), 100, 100, 5555, 64, MPENote::keyDown);
                expectEquals (test.notePitchbendChangedCallCounter, 1);
            }
            {
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                // Richard's edge case:
                // - press one note
                // - press sustain (careful: must be sent on master channel)
                // - release first note (is still sustained!)
                // - press another note (happens to be on the same MIDI channel!)
                // - pitchbend that other note
                // - the first note should not be bent, only the second one.

                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.sustainPedal (2, true);
                test.noteOff (3, 60, MPEValue::from7BitInt (64));
                expectEquals (test.getNumPlayingNotes(), 1);
                expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::sustained);
                expectEquals (test.noteKeyStateChangedCallCounter, 2);

                test.noteOn (3, 61, MPEValue::from7BitInt (100));
                test.pitchbend (3, MPEValue::from14BitInt (6666));
                expectEquals (test.getNumPlayingNotes(), 2);
                expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::sustained);
                expectNote (test.getNote (3, 61), 100, 100, 6666, 64, MPENote::keyDownAndSustained);
                expectEquals (test.notePitchbendChangedCallCounter, 1);
            }
            {
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                // Zsolt's edge case:
                // - press one note
                // - modulate pitchbend or timbre
                // - release the note
                // - press same note again without sending a pitchbend or timbre message before the note-on
                // - the note should be turned on with a default value for pitchbend/timbre,
                //   and *not* the last value received on channel.

                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.pitchbend (3, MPEValue::from14BitInt (5555));
                expectNote (test.getNote (3, 60), 100, 100, 5555, 64, MPENote::keyDown);

                test.noteOff (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);
            }
            {
                // applying per-note pitchbend should set the note's totalPitchbendInSemitones
                // correctly depending on the per-note pitchbend range of the zone.
                UnitTestInstrument test;

                MPEZoneLayout layout = testLayout;
                test.setZoneLayout (layout);  // default should be +/- 48 semitones
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.pitchbend (3, MPEValue::from14BitInt (4096));
                expectDoubleWithinRelativeError (test.getMostRecentNote (3).totalPitchbendInSemitones, -24.0, 0.01);

                layout.getZoneByIndex (0)->setPerNotePitchbendRange (96);
                test.setZoneLayout (layout);
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.pitchbend (3, MPEValue::from14BitInt (0)); // -max
                expectDoubleWithinRelativeError (test.getMostRecentNote (3).totalPitchbendInSemitones, -96.0, 0.01);

                layout.getZoneByIndex (0)->setPerNotePitchbendRange (1);
                test.setZoneLayout (layout);
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.pitchbend (3, MPEValue::from14BitInt (16383)); // +max
                expectDoubleWithinRelativeError (test.getMostRecentNote (3).totalPitchbendInSemitones, 1.0, 0.01);

                layout.getZoneByIndex (0)->setPerNotePitchbendRange (0); // pitchbendrange = 0 --> no pitchbend at all
                test.setZoneLayout (layout);
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.pitchbend (3, MPEValue::from14BitInt (12345));
                expectDoubleWithinRelativeError (test.getMostRecentNote (3).totalPitchbendInSemitones, 0.0, 0.01);
            }
            {
                // applying master pitchbend should set the note's totalPitchbendInSemitones
                // correctly depending on the master pitchbend range of the zone.
                UnitTestInstrument test;

                MPEZoneLayout layout = testLayout;
                test.setZoneLayout (layout);  // default should be +/- 2 semitones
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.pitchbend (2, MPEValue::from14BitInt (4096)); //halfway between -max and centre
                expectDoubleWithinRelativeError (test.getMostRecentNote (3).totalPitchbendInSemitones, -1.0, 0.01);

                layout.getZoneByIndex (0)->setMasterPitchbendRange (96);
                test.setZoneLayout (layout);
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.pitchbend (2, MPEValue::from14BitInt (0)); // -max
                expectDoubleWithinRelativeError (test.getMostRecentNote (3).totalPitchbendInSemitones, -96.0, 0.01);

                layout.getZoneByIndex (0)->setMasterPitchbendRange (1);
                test.setZoneLayout (layout);
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.pitchbend (2, MPEValue::from14BitInt (16383)); // +max
                expectDoubleWithinRelativeError (test.getMostRecentNote (3).totalPitchbendInSemitones, 1.0, 0.01);

                layout.getZoneByIndex (0)->setMasterPitchbendRange (0); // pitchbendrange = 0 --> no pitchbend at all
                test.setZoneLayout (layout);
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.pitchbend (2, MPEValue::from14BitInt (12345));
                expectDoubleWithinRelativeError (test.getMostRecentNote (3).totalPitchbendInSemitones, 0.0, 0.01);
            }
            {
                // applying both per-note and master pitchbend simultaneously should set
                // the note's totalPitchbendInSemitones to the sum of both, correctly
                // weighted with the per-note and master pitchbend range, respectively.
                UnitTestInstrument test;

                MPEZoneLayout layout = testLayout;
                layout.getZoneByIndex (0)->setPerNotePitchbendRange (12);
                layout.getZoneByIndex (0)->setMasterPitchbendRange (1);
                test.setZoneLayout (layout);

                test.pitchbend (2, MPEValue::from14BitInt (4096)); // master pitchbend 0.5 semitones down
                test.pitchbend (3, MPEValue::from14BitInt (0)); // per-note pitchbend 12 semitones down
                // additionally, note should react to both pitchbend messages
                // correctly even if they arrived before the note-on.
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                expectDoubleWithinRelativeError (test.getMostRecentNote (3).totalPitchbendInSemitones, -12.5, 0.01);
            }
        }

        beginTest ("timbre");
        {
            {
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (4, 60, MPEValue::from7BitInt (100));
                test.noteOn (10, 60, MPEValue::from7BitInt (100));

                // modulating timbre on a per-note channel should modulate one note
                test.timbre (3, MPEValue::from7BitInt (33));
                expectNote (test.getNote (3, 60), 100, 100, 8192, 33, MPENote::keyDown);
                expectNote (test.getNote (4, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (10, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectEquals (test.noteTimbreChangedCallCounter, 1);

                // modulating timbre on a master channel should modulate all notes in this zone
                test.timbre (2, MPEValue::from7BitInt (44));
                expectNote (test.getNote (3, 60), 100, 100, 8192, 44, MPENote::keyDown);
                expectNote (test.getNote (4, 60), 100, 100, 8192, 44, MPENote::keyDown);
                expectNote (test.getNote (10, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectEquals (test.noteTimbreChangedCallCounter, 3);

                // modulating timbre on an unrelated channel should be ignored
                test.timbre (1, MPEValue::from7BitInt (55));
                expectNote (test.getNote (3, 60), 100, 100, 8192, 44, MPENote::keyDown);
                expectNote (test.getNote (4, 60), 100, 100, 8192, 44, MPENote::keyDown);
                expectNote (test.getNote (10, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectEquals (test.noteTimbreChangedCallCounter, 3);
            }
            {
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                // two notes on same channel - only last added should be modulated
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (3, 61, MPEValue::from7BitInt (100));
                test.timbre (3, MPEValue::from7BitInt (66));
                expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 61), 100, 100, 8192, 66, MPENote::keyDown);
                expectEquals (test.noteTimbreChangedCallCounter, 1);
            }
            {
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                // edge case: two notes on same channel, one gets released,
                // then the other should be modulated
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (3, 61, MPEValue::from7BitInt (100));
                test.noteOff (3, 61, MPEValue::from7BitInt (100));
                test.timbre (3, MPEValue::from7BitInt (77));
                expectEquals (test.getNumPlayingNotes(), 1);
                expectNote (test.getNote (3, 60), 100, 100, 8192, 77, MPENote::keyDown);
                expectEquals (test.noteTimbreChangedCallCounter, 1);
            }
            {
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                // Zsolt's edge case for timbre
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.timbre (3, MPEValue::from7BitInt (42));
                expectNote (test.getNote (3, 60), 100, 100, 8192, 42, MPENote::keyDown);

                test.noteOff (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);
            }
        }

        beginTest ("setPressureTrackingMode");
        {
            {
                // last note played (= default)
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                test.setPressureTrackingMode (MPEInstrument::lastNotePlayedOnChannel);
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (3, 62, MPEValue::from7BitInt (100));
                test.noteOn (3, 61, MPEValue::from7BitInt (100));
                test.pressure (3, MPEValue::from7BitInt (99));
                expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 62), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 61), 100, 99,  8192, 64, MPENote::keyDown);
                expectEquals (test.notePressureChangedCallCounter, 1);
            }
            {
                // lowest note
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                test.setPressureTrackingMode (MPEInstrument::lowestNoteOnChannel);
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (3, 62, MPEValue::from7BitInt (100));
                test.noteOn (3, 61, MPEValue::from7BitInt (100));
                test.pressure (3, MPEValue::from7BitInt (99));
                expectNote (test.getNote (3, 60), 100, 99,  8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 62), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 61), 100, 100, 8192, 64, MPENote::keyDown);
                expectEquals (test.notePressureChangedCallCounter, 1);
            }
            {
                // highest note
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                test.setPressureTrackingMode (MPEInstrument::highestNoteOnChannel);
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (3, 62, MPEValue::from7BitInt (100));
                test.noteOn (3, 61, MPEValue::from7BitInt (100));
                test.pressure (3, MPEValue::from7BitInt (99));
                expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 62), 100, 99,  8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 61), 100, 100, 8192, 64, MPENote::keyDown);
                expectEquals (test.notePressureChangedCallCounter, 1);
            }
            {
                // all notes
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                test.setPressureTrackingMode (MPEInstrument::allNotesOnChannel);
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (3, 62, MPEValue::from7BitInt (100));
                test.noteOn (3, 61, MPEValue::from7BitInt (100));
                test.pressure (3, MPEValue::from7BitInt (99));
                expectNote (test.getNote (3, 60), 100, 99, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 62), 100, 99, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 61), 100, 99, 8192, 64, MPENote::keyDown);
                expectEquals (test.notePressureChangedCallCounter, 3);
            }
        }

        beginTest ("setPitchbendTrackingMode");
        {
            {
                // last note played (= default)
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                test.setPitchbendTrackingMode (MPEInstrument::lastNotePlayedOnChannel);
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (3, 62, MPEValue::from7BitInt (100));
                test.noteOn (3, 61, MPEValue::from7BitInt (100));
                test.pitchbend (3, MPEValue::from14BitInt (9999));
                expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 62), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 61), 100, 100, 9999, 64, MPENote::keyDown);
                expectEquals (test.notePitchbendChangedCallCounter, 1);
            }
            {
                // lowest note
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                test.setPitchbendTrackingMode (MPEInstrument::lowestNoteOnChannel);
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (3, 62, MPEValue::from7BitInt (100));
                test.noteOn (3, 61, MPEValue::from7BitInt (100));
                test.pitchbend (3, MPEValue::from14BitInt (9999));
                expectNote (test.getNote (3, 60), 100, 100, 9999, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 62), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 61), 100, 100, 8192, 64, MPENote::keyDown);
                expectEquals (test.notePitchbendChangedCallCounter, 1);
            }
            {
                // highest note
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                test.setPitchbendTrackingMode (MPEInstrument::highestNoteOnChannel);
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (3, 62, MPEValue::from7BitInt (100));
                test.noteOn (3, 61, MPEValue::from7BitInt (100));
                test.pitchbend (3, MPEValue::from14BitInt (9999));
                expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 62), 100, 100, 9999, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 61), 100, 100, 8192, 64, MPENote::keyDown);
                expectEquals (test.notePitchbendChangedCallCounter, 1);
            }
            {
                // all notes
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                test.setPitchbendTrackingMode (MPEInstrument::allNotesOnChannel);
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (3, 62, MPEValue::from7BitInt (100));
                test.noteOn (3, 61, MPEValue::from7BitInt (100));
                test.pitchbend (3, MPEValue::from14BitInt (9999));
                expectNote (test.getNote (3, 60), 100, 100, 9999, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 62), 100, 100, 9999, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 61), 100, 100, 9999, 64, MPENote::keyDown);
                expectEquals (test.notePitchbendChangedCallCounter, 3);
            }
        }

        beginTest ("setTimbreTrackingMode");
        {
            {
                // last note played (= default)
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                test.setTimbreTrackingMode (MPEInstrument::lastNotePlayedOnChannel);
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (3, 62, MPEValue::from7BitInt (100));
                test.noteOn (3, 61, MPEValue::from7BitInt (100));
                test.timbre (3, MPEValue::from7BitInt (99));
                expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 62), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 61), 100, 100, 8192, 99, MPENote::keyDown);
                expectEquals (test.noteTimbreChangedCallCounter, 1);
            }
            {
                // lowest note
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                test.setTimbreTrackingMode (MPEInstrument::lowestNoteOnChannel);
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (3, 62, MPEValue::from7BitInt (100));
                test.noteOn (3, 61, MPEValue::from7BitInt (100));
                test.timbre (3, MPEValue::from7BitInt (99));
                expectNote (test.getNote (3, 60), 100, 100, 8192, 99, MPENote::keyDown);
                expectNote (test.getNote (3, 62), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 61), 100, 100, 8192, 64, MPENote::keyDown);
                expectEquals (test.noteTimbreChangedCallCounter, 1);
            }
            {
                // highest note
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                test.setTimbreTrackingMode (MPEInstrument::highestNoteOnChannel);
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (3, 62, MPEValue::from7BitInt (100));
                test.noteOn (3, 61, MPEValue::from7BitInt (100));
                test.timbre (3, MPEValue::from7BitInt (99));
                expectNote (test.getNote (3, 60), 100, 100, 8192, 64, MPENote::keyDown);
                expectNote (test.getNote (3, 62), 100, 100, 8192, 99, MPENote::keyDown);
                expectNote (test.getNote (3, 61), 100, 100, 8192, 64, MPENote::keyDown);
                expectEquals (test.noteTimbreChangedCallCounter, 1);
            }
            {
                // all notes
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);

                test.setTimbreTrackingMode (MPEInstrument::allNotesOnChannel);
                test.noteOn (3, 60, MPEValue::from7BitInt (100));
                test.noteOn (3, 62, MPEValue::from7BitInt (100));
                test.noteOn (3, 61, MPEValue::from7BitInt (100));
                test.timbre (3, MPEValue::from7BitInt (99));
                expectNote (test.getNote (3, 60), 100, 100, 8192, 99, MPENote::keyDown);
                expectNote (test.getNote (3, 62), 100, 100, 8192, 99, MPENote::keyDown);
                expectNote (test.getNote (3, 61), 100, 100, 8192, 99, MPENote::keyDown);
                expectEquals (test.noteTimbreChangedCallCounter, 3);
            }
        }

        beginTest ("processNextMidiEvent");
        {
            UnitTestInstrument test;

            // note on should trigger noteOn method call

            test.processNextMidiEvent (MidiMessage::noteOn (3, 42, uint8 (92)));
            expectEquals (test.noteOnCallCounter, 1);
            expectEquals (test.lastMidiChannelReceived, 3);
            expectEquals (test.lastMidiNoteNumberReceived, 42);
            expectEquals (test.lastMPEValueReceived.as7BitInt(), 92);

            // note off should trigger noteOff method call

            test.processNextMidiEvent (MidiMessage::noteOff (4, 12, uint8 (33)));
            expectEquals (test.noteOffCallCounter, 1);
            expectEquals (test.lastMidiChannelReceived, 4);
            expectEquals (test.lastMidiNoteNumberReceived, 12);
            expectEquals (test.lastMPEValueReceived.as7BitInt(), 33);

            // note on with velocity = 0 should trigger noteOff method call
            // with a note off velocity of 64 (centre value)

            test.processNextMidiEvent (MidiMessage::noteOn (5, 11, uint8 (0)));
            expectEquals (test.noteOffCallCounter, 2);
            expectEquals (test.lastMidiChannelReceived, 5);
            expectEquals (test.lastMidiNoteNumberReceived, 11);
            expectEquals (test.lastMPEValueReceived.as7BitInt(), 64);

            // pitchwheel message should trigger pitchbend method call

            test.processNextMidiEvent (MidiMessage::pitchWheel (1, 3333));
            expectEquals (test.pitchbendCallCounter, 1);
            expectEquals (test.lastMidiChannelReceived, 1);
            expectEquals (test.lastMPEValueReceived.as14BitInt(), 3333);

            // pressure using channel pressure message (7-bit value) should
            // trigger pressure method call

            test.processNextMidiEvent (MidiMessage::channelPressureChange (10, 35));
            expectEquals (test.pressureCallCounter, 1);
            expectEquals (test.lastMidiChannelReceived, 10);
            expectEquals (test.lastMPEValueReceived.as7BitInt(), 35);

            // pressure using 14-bit value over CC70 and CC102 should trigger
            // pressure method call after the MSB is sent

            // a) sending only the MSB
            test.processNextMidiEvent (MidiMessage::controllerEvent (3, 70, 120));
            expectEquals (test.pressureCallCounter, 2);
            expectEquals (test.lastMidiChannelReceived, 3);
            expectEquals (test.lastMPEValueReceived.as7BitInt(), 120);

            // b) sending LSB and MSB (only the MSB should trigger the call) - per MIDI channel!
            test.processNextMidiEvent (MidiMessage::controllerEvent (4, 102, 121));
            expectEquals (test.pressureCallCounter, 2);
            test.processNextMidiEvent (MidiMessage::controllerEvent (5, 102, 122));
            expectEquals (test.pressureCallCounter, 2);
            test.processNextMidiEvent (MidiMessage::controllerEvent (4, 70, 123));
            expectEquals (test.pressureCallCounter, 3);
            expectEquals (test.lastMidiChannelReceived, 4);
            expectEquals (test.lastMPEValueReceived.as14BitInt(), 121 + (123 << 7));
            test.processNextMidiEvent (MidiMessage::controllerEvent (5, 70, 124));
            expectEquals (test.pressureCallCounter, 4);
            expectEquals (test.lastMidiChannelReceived, 5);
            expectEquals (test.lastMPEValueReceived.as14BitInt(), 122 + (124 << 7));
            test.processNextMidiEvent (MidiMessage::controllerEvent (5, 70, 64));
            expectEquals (test.pressureCallCounter, 5);
            expectEquals (test.lastMidiChannelReceived, 5);
            expectEquals (test.lastMPEValueReceived.as7BitInt(), 64);

            // same for timbre 14-bit value over CC74 and CC106
            test.processNextMidiEvent (MidiMessage::controllerEvent (3, 74, 120));
            expectEquals (test.timbreCallCounter, 1);
            expectEquals (test.lastMidiChannelReceived, 3);
            expectEquals (test.lastMPEValueReceived.as7BitInt(), 120);
            test.processNextMidiEvent (MidiMessage::controllerEvent (4, 106, 121));
            expectEquals (test.timbreCallCounter, 1);
            test.processNextMidiEvent (MidiMessage::controllerEvent (5, 106, 122));
            expectEquals (test.timbreCallCounter, 1);
            test.processNextMidiEvent (MidiMessage::controllerEvent (4, 74, 123));
            expectEquals (test.timbreCallCounter, 2);
            expectEquals (test.lastMidiChannelReceived, 4);
            expectEquals (test.lastMPEValueReceived.as14BitInt(), 121 + (123 << 7));
            test.processNextMidiEvent (MidiMessage::controllerEvent (5, 74, 124));
            expectEquals (test.timbreCallCounter, 3);
            expectEquals (test.lastMidiChannelReceived, 5);
            expectEquals (test.lastMPEValueReceived.as14BitInt(), 122 + (124 << 7));
            test.processNextMidiEvent (MidiMessage::controllerEvent (5, 74, 64));
            expectEquals (test.timbreCallCounter, 4);
            expectEquals (test.lastMidiChannelReceived, 5);
            expectEquals (test.lastMPEValueReceived.as7BitInt(), 64);

            // sustain pedal message (CC64) should trigger sustainPedal method call
            test.processNextMidiEvent (MidiMessage::controllerEvent (1, 64, 127));
            expectEquals (test.sustainPedalCallCounter, 1);
            expectEquals (test.lastMidiChannelReceived, 1);
            expect (test.lastSustainPedalValueReceived);
            test.processNextMidiEvent (MidiMessage::controllerEvent (16, 64, 0));
            expectEquals (test.sustainPedalCallCounter, 2);
            expectEquals (test.lastMidiChannelReceived, 16);
            expect (! test.lastSustainPedalValueReceived);

            // sostenuto pedal message (CC66) should trigger sostenutoPedal method call
            test.processNextMidiEvent (MidiMessage::controllerEvent (1, 66, 127));
            expectEquals (test.sostenutoPedalCallCounter, 1);
            expectEquals (test.lastMidiChannelReceived, 1);
            expect (test.lastSostenutoPedalValueReceived);
            test.processNextMidiEvent (MidiMessage::controllerEvent (16, 66, 0));
            expectEquals (test.sostenutoPedalCallCounter, 2);
            expectEquals (test.lastMidiChannelReceived, 16);
            expect (! test.lastSostenutoPedalValueReceived);
        }
        {
            // MIDI messages modifying the zone layout should be correctly
            // forwarded to the internal zone layout and modify it.
            // (testing the actual logic of the zone layout is done in the
            // MPEZoneLayout unit tests)
            MPEInstrument test;

            MidiBuffer buffer;
            buffer.addEvents (MPEMessages::addZone (MPEZone (2, 5)), 0, -1, 0);
            buffer.addEvents (MPEMessages::addZone (MPEZone (9, 6)), 0, -1, 0);

            MidiBuffer::Iterator iter (buffer);
            MidiMessage message;
            int samplePosition; // not actually used, so no need to initialise.

            while (iter.getNextEvent (message, samplePosition))
                test.processNextMidiEvent (message);

            expectEquals (test.getZoneLayout().getNumZones(), 2);
            expectEquals (test.getZoneLayout().getZoneByIndex (0)->getMasterChannel(), 2);
            expectEquals (test.getZoneLayout().getZoneByIndex (0)->getNumNoteChannels(), 5);
            expectEquals (test.getZoneLayout().getZoneByIndex (1)->getMasterChannel(), 9);
            expectEquals (test.getZoneLayout().getZoneByIndex (1)->getNumNoteChannels(), 6);
        }

        beginTest ("MIDI all notes off");
        {
            UnitTestInstrument test;
            test.setZoneLayout (testLayout);
            test.noteOn (3, 60, MPEValue::from7BitInt (100));
            test.noteOn (4, 61, MPEValue::from7BitInt (100));
            test.noteOn (15, 62, MPEValue::from7BitInt (100));
            test.noteOn (15, 63, MPEValue::from7BitInt (100));
            expectEquals (test.getNumPlayingNotes(), 4);

            // on note channel: ignore.
            test.processNextMidiEvent (MidiMessage::allNotesOff (3));
            expectEquals (test.getNumPlayingNotes(), 4);

            // on unused channel: ignore.
            test.processNextMidiEvent (MidiMessage::allNotesOff (1));
            expectEquals (test.getNumPlayingNotes(), 4);

            // on master channel: release notes in that zone only.
            test.processNextMidiEvent (MidiMessage::allNotesOff (2));
            expectEquals (test.getNumPlayingNotes(), 2);
            test.processNextMidiEvent (MidiMessage::allNotesOff (9));
            expectEquals (test.getNumPlayingNotes(), 0);
        }

        beginTest ("MIDI all notes off (omni mode)");
        {
            UnitTestInstrument test;
            test.enableOmniMode();
            test.noteOn (3, 60, MPEValue::from7BitInt (100));
            test.noteOn (4, 61, MPEValue::from7BitInt (100));
            test.noteOn (15, 62, MPEValue::from7BitInt (100));
            test.noteOn (15, 63, MPEValue::from7BitInt (100));
            expectEquals (test.getNumPlayingNotes(), 4);

            test.processNextMidiEvent (MidiMessage::allNotesOff (3));
            expectEquals (test.getNumPlayingNotes(), 3);

            test.processNextMidiEvent (MidiMessage::allNotesOff (15));
            expectEquals (test.getNumPlayingNotes(), 1);

            test.processNextMidiEvent (MidiMessage::allNotesOff (4));
            expectEquals (test.getNumPlayingNotes(), 0);
        }

        beginTest ("default getInitial...ForNoteOn");
        {
            MPEInstrument test;
            test.setZoneLayout (testLayout);

            test.pitchbend (3, MPEValue::from14BitInt (3333));  // use for next note-on on ch. 3
            test.pitchbend (2, MPEValue::from14BitInt (4444));  // ignore
            test.pitchbend (2, MPEValue::from14BitInt (5555));  // ignore

            test.timbre (3, MPEValue::from7BitInt (66));  // use for next note-on on ch. 3
            test.timbre (2, MPEValue::from7BitInt (77));  // ignore
            test.timbre (2, MPEValue::from7BitInt (88));  // ignore

            test.noteOn (3, 60, MPEValue::from7BitInt (100));

            expectNote (test.getMostRecentNote (3), 100, 100, 3333, 66, MPENote::keyDown);
        }

        beginTest ("overriding getInitial...ForNoteOn");
        {
            CustomInitialValuesTest<33, 4444, 55> test;
            test.setZoneLayout (testLayout);

            test.noteOn (3, 61, MPEValue::from7BitInt (100));
            expectNote (test.getMostRecentNote (3), 100, 33, 4444, 55, MPENote::keyDown);
        }

        beginTest ("Omni mode");
        {
            {
                // basic check
                MPEInstrument test;
                expect (! test.isOmniModeEnabled());

                test.setZoneLayout (testLayout);
                expect (! test.isOmniModeEnabled());

                test.enableOmniMode();
                expect (test.isOmniModeEnabled());

                test.setZoneLayout (testLayout);
                expect (! test.isOmniModeEnabled());
            }
            {
                // note on should trigger notes on all 16 channels

                UnitTestInstrument test;
                test.enableOmniMode();

                test.noteOn (1,  60, MPEValue::from7BitInt (100));
                test.noteOn (2,  60, MPEValue::from7BitInt (100));
                test.noteOn (15, 60, MPEValue::from7BitInt (100));
                test.noteOn (16, 60, MPEValue::from7BitInt (100));
                expectEquals (test.getNumPlayingNotes(), 4);

                // polyphonic modulation should work across all 16 channels

                test.pitchbend (1, MPEValue::from14BitInt (9999));
                test.pressure (2, MPEValue::from7BitInt (88));
                test.timbre (15, MPEValue::from7BitInt (77));

                expectNote (test.getNote (1, 60),  100, 100, 9999, 64, MPENote::keyDown);
                expectNote (test.getNote (2, 60),  100, 88,  8192, 64, MPENote::keyDown);
                expectNote (test.getNote (15, 60), 100, 100, 8192, 77, MPENote::keyDown);
                expectNote (test.getNote (16, 60), 100, 100, 8192, 64, MPENote::keyDown);

                // note off should work in omni mode

                test.noteOff (15, 60, MPEValue::from7BitInt (0));
                test.noteOff (1,  60, MPEValue::from7BitInt (0));
                test.noteOff (2,  60, MPEValue::from7BitInt (0));
                test.noteOff (16, 60, MPEValue::from7BitInt (0));
                expectEquals (test.getNumPlayingNotes(), 0);
            }
            {
                // tracking mode in omni mode
                {
                    UnitTestInstrument test;
                    test.enableOmniMode();

                    test.setPitchbendTrackingMode (MPEInstrument::lastNotePlayedOnChannel);
                    test.noteOn (1,  60, MPEValue::from7BitInt (100));
                    test.noteOn (1,  62, MPEValue::from7BitInt (100));
                    test.noteOn (1,  61, MPEValue::from7BitInt (100));
                    test.pitchbend (1, MPEValue::from14BitInt (9999));
                    expectNote (test.getNote (1, 60),  100, 100, 8192, 64, MPENote::keyDown);
                    expectNote (test.getNote (1, 61),  100, 100, 9999, 64, MPENote::keyDown);
                    expectNote (test.getNote (1, 62),  100, 100, 8192, 64, MPENote::keyDown);
                }
                {
                    UnitTestInstrument test;
                    test.enableOmniMode();

                    test.setPitchbendTrackingMode (MPEInstrument::lowestNoteOnChannel);
                    test.noteOn (1,  60, MPEValue::from7BitInt (100));
                    test.noteOn (1,  62, MPEValue::from7BitInt (100));
                    test.noteOn (1,  61, MPEValue::from7BitInt (100));
                    test.pitchbend (1, MPEValue::from14BitInt (9999));
                    expectNote (test.getNote (1, 60),  100, 100, 9999, 64, MPENote::keyDown);
                    expectNote (test.getNote (1, 61),  100, 100,  8192, 64, MPENote::keyDown);
                    expectNote (test.getNote (1, 62),  100, 100,  8192, 64, MPENote::keyDown);
                }
                {
                    UnitTestInstrument test;
                    test.enableOmniMode();

                    test.setPitchbendTrackingMode (MPEInstrument::highestNoteOnChannel);
                    test.noteOn (1,  60, MPEValue::from7BitInt (100));
                    test.noteOn (1,  62, MPEValue::from7BitInt (100));
                    test.noteOn (1,  61, MPEValue::from7BitInt (100));
                    test.pitchbend (1, MPEValue::from14BitInt (9999));
                    expectNote (test.getNote (1, 60),  100, 100, 8192, 64, MPENote::keyDown);
                    expectNote (test.getNote (1, 61),  100, 100,  8192, 64, MPENote::keyDown);
                    expectNote (test.getNote (1, 62),  100, 100,  9999, 64, MPENote::keyDown);
                }
                {
                    UnitTestInstrument test;
                    test.enableOmniMode();

                    test.setPitchbendTrackingMode (MPEInstrument::allNotesOnChannel);
                    test.noteOn (1,  60, MPEValue::from7BitInt (100));
                    test.noteOn (1,  62, MPEValue::from7BitInt (100));
                    test.noteOn (1,  61, MPEValue::from7BitInt (100));
                    test.pitchbend (1, MPEValue::from14BitInt (9999));
                    expectNote (test.getNote (1, 60),  100, 100, 9999, 64, MPENote::keyDown);
                    expectNote (test.getNote (1, 61),  100, 100,  9999, 64, MPENote::keyDown);
                    expectNote (test.getNote (1, 62),  100, 100,  9999, 64, MPENote::keyDown);
                }
            }
            {
                // custom pitchbend range in omni mode.
                UnitTestInstrument test;
                test.enableOmniMode (11);

                test.pitchbend (1, MPEValue::from14BitInt (4096));
                test.noteOn (1, 60, MPEValue::from7BitInt (100));
                expectDoubleWithinRelativeError (test.getMostRecentNote (1).totalPitchbendInSemitones, -5.5, 0.01);
            }
            {
                // sustain pedal should be per channel in omni mode.
                UnitTestInstrument test;
                test.enableOmniMode();

                test.sustainPedal (1, true);
                test.noteOn (2,  61, MPEValue::from7BitInt (100));
                test.noteOff (2,  61, MPEValue::from7BitInt (100));
                test.noteOn (1, 60, MPEValue::from7BitInt (100));
                test.noteOff (1, 60, MPEValue::from7BitInt (100));

                expectEquals (test.getNumPlayingNotes(), 1);
                expectNote (test.getNote (1, 60), 100, 100, 8192, 64, MPENote::sustained);

                test.sustainPedal (1, false);
                expectEquals (test.getNumPlayingNotes(), 0);
            }
            {
                // sostenuto pedal should be per channel in omni mode.
                UnitTestInstrument test;
                test.enableOmniMode();

                test.noteOn (1, 60, MPEValue::from7BitInt (100));
                test.sostenutoPedal (1, true);
                test.noteOff (1, 60, MPEValue::from7BitInt (100));
                test.noteOn (2,  61, MPEValue::from7BitInt (100));
                test.noteOff (2,  61, MPEValue::from7BitInt (100));

                expectEquals (test.getNumPlayingNotes(), 1);
                expectNote (test.getNote (1, 60), 100, 100, 8192, 64, MPENote::sustained);

                test.sostenutoPedal (1, false);
                expectEquals (test.getNumPlayingNotes(), 0);
            }
            {
                // all notes released when switching layout
                UnitTestInstrument test;
                test.setZoneLayout (testLayout);
                test.noteOn (3,  60, MPEValue::from7BitInt (100));
                expectEquals (test.getNumPlayingNotes(), 1);

                test.enableOmniMode();
                expectEquals (test.getNumPlayingNotes(), 0);
                test.noteOn (3,  60, MPEValue::from7BitInt (100));
                expectEquals (test.getNumPlayingNotes(), 1);

                test.setZoneLayout (testLayout);
                expectEquals (test.getNumPlayingNotes(), 0);
            }
        }
    }

private:
    //==========================================================================
    /* This mock class is used for unit testing whether the methods of
       MPEInstrument are called correctly.
    */
    class UnitTestInstrument : public MPEInstrument,
                               private MPEInstrument::Listener
    {
        typedef MPEInstrument Base;
    public:
        UnitTestInstrument()
            : noteOnCallCounter (0),  noteOffCallCounter (0), pitchbendCallCounter (0),
              pressureCallCounter (0), timbreCallCounter (0), sustainPedalCallCounter (0),
              sostenutoPedalCallCounter (0), noteAddedCallCounter (0), notePressureChangedCallCounter (0),
              notePitchbendChangedCallCounter (0), noteTimbreChangedCallCounter (0),
              noteKeyStateChangedCallCounter (0), noteReleasedCallCounter (0),
              lastMidiChannelReceived (-1), lastMidiNoteNumberReceived (-1),
              lastSustainPedalValueReceived (false), lastSostenutoPedalValueReceived (false)
        {
            addListener (this);
        }

        void noteOn (int midiChannel, int midiNoteNumber, MPEValue midiNoteOnVelocity) override
        {
            Base::noteOn (midiChannel, midiNoteNumber, midiNoteOnVelocity);

            noteOnCallCounter++;
            lastMidiChannelReceived = midiChannel;
            lastMidiNoteNumberReceived = midiNoteNumber;
            lastMPEValueReceived = midiNoteOnVelocity;
        }

        void noteOff (int midiChannel, int midiNoteNumber, MPEValue midiNoteOffVelocity) override
        {
            Base::noteOff (midiChannel, midiNoteNumber, midiNoteOffVelocity);

            noteOffCallCounter++;
            lastMidiChannelReceived = midiChannel;
            lastMidiNoteNumberReceived = midiNoteNumber;
            lastMPEValueReceived = midiNoteOffVelocity;
        }

        void pitchbend (int midiChannel, MPEValue value) override
        {
            Base::pitchbend (midiChannel, value);

            pitchbendCallCounter++;
            lastMidiChannelReceived = midiChannel;
            lastMPEValueReceived = value;
        }

        void pressure (int midiChannel, MPEValue value) override
        {
            Base::pressure (midiChannel, value);

            pressureCallCounter++;
            lastMidiChannelReceived = midiChannel;
            lastMPEValueReceived = value;
        }

        void timbre (int midiChannel, MPEValue value) override
        {
            Base::timbre (midiChannel, value);

            timbreCallCounter++;
            lastMidiChannelReceived = midiChannel;
            lastMPEValueReceived = value;
        }

        void sustainPedal (int midiChannel, bool value) override
        {
            Base::sustainPedal (midiChannel, value);

            sustainPedalCallCounter++;
            lastMidiChannelReceived = midiChannel;
            lastSustainPedalValueReceived = value;
        }

        void sostenutoPedal (int midiChannel, bool value) override
        {
            Base::sostenutoPedal (midiChannel, value);

            sostenutoPedalCallCounter++;
            lastMidiChannelReceived = midiChannel;
            lastSostenutoPedalValueReceived = value;
        }

        int noteOnCallCounter,  noteOffCallCounter, pitchbendCallCounter,
            pressureCallCounter, timbreCallCounter, sustainPedalCallCounter,
            sostenutoPedalCallCounter, noteAddedCallCounter,
            notePressureChangedCallCounter, notePitchbendChangedCallCounter,
            noteTimbreChangedCallCounter, noteKeyStateChangedCallCounter,
            noteReleasedCallCounter, lastMidiChannelReceived, lastMidiNoteNumberReceived;

        bool lastSustainPedalValueReceived, lastSostenutoPedalValueReceived;
        MPEValue lastMPEValueReceived;
        ScopedPointer<MPENote> lastNoteFinished;

    private:
        //======================================================================
        void noteAdded (MPENote) override              { noteAddedCallCounter++; }

        void notePressureChanged (MPENote) override    { notePressureChangedCallCounter++; }
        void notePitchbendChanged (MPENote) override   { notePitchbendChangedCallCounter++; }
        void noteTimbreChanged (MPENote) override      { noteTimbreChangedCallCounter++; }
        void noteKeyStateChanged (MPENote) override    { noteKeyStateChangedCallCounter++; }

        void noteReleased (MPENote finishedNote) override
        {
            noteReleasedCallCounter++;
            lastNoteFinished = new MPENote (finishedNote);
        }
    };

    //==========================================================================
    template <int initial7BitPressure, int initial14BitPitchbend, int initial7BitTimbre>
    class CustomInitialValuesTest : public MPEInstrument
    {
        MPEValue getInitialPitchbendForNoteOn (int, int, MPEValue) const override
        {
            return MPEValue::from14BitInt (initial14BitPitchbend);
        }

        MPEValue getInitialPressureForNoteOn (int, int, MPEValue) const override
        {
            return MPEValue::from7BitInt (initial7BitPressure);
        }

        MPEValue getInitialTimbreForNoteOn (int, int, MPEValue) const override
        {
            return MPEValue::from7BitInt (initial7BitTimbre);
        }
    };

    //==========================================================================
    void expectNote (MPENote noteToTest,
                     int noteOnVelocity7Bit,
                     int pressure7Bit,
                     int pitchbend14Bit,
                     int timbre7Bit,
                     MPENote::KeyState keyState)
    {
        expect (noteToTest.isValid());
        expectEquals (noteToTest.noteOnVelocity.as7BitInt(), noteOnVelocity7Bit);
        expectEquals (noteToTest.pressure.as7BitInt(), pressure7Bit);
        expectEquals (noteToTest.pitchbend.as14BitInt(), pitchbend14Bit);
        expectEquals (noteToTest.timbre.as7BitInt(),timbre7Bit);
        expect (noteToTest.keyState == keyState);
    }

    void expectHasFinishedNote (const UnitTestInstrument& test,
                                int channel, int noteNumber, int noteOffVelocity7Bit)
    {
        expect (test.lastNoteFinished != nullptr);
        expectEquals (int (test.lastNoteFinished->midiChannel), channel);
        expectEquals (int (test.lastNoteFinished->initialNote), noteNumber);
        expectEquals (test.lastNoteFinished->noteOffVelocity.as7BitInt(), noteOffVelocity7Bit);
        expect (test.lastNoteFinished->keyState == MPENote::off);
    }

    void expectDoubleWithinRelativeError (double actual, double expected, double maxRelativeError)
    {
        const double maxAbsoluteError = jmax (1.0, std::fabs (expected)) * maxRelativeError;
        expect (std::fabs (expected - actual) < maxAbsoluteError);
    }

    //==========================================================================
    MPEZoneLayout testLayout;
};

static MPEInstrumentTests MPEInstrumentUnitTests;

#endif // JUCE_UNIT_TESTS