diff --git a/extras/Demo/Source/Demos/AudioLatencyDemo.cpp b/extras/Demo/Source/Demos/AudioLatencyDemo.cpp
index f29694e751..f16ce79c07 100644
--- a/extras/Demo/Source/Demos/AudioLatencyDemo.cpp
+++ b/extras/Demo/Source/Demos/AudioLatencyDemo.cpp
@@ -32,9 +32,7 @@ class LatencyTester  : public AudioIODeviceCallback,
 {
 public:
     LatencyTester (TextEditor& resultsBox_)
-        : testSound (1, 1),
-          recordedSound (1, 1),
-          playingSampleNum (0),
+        : playingSampleNum (0),
           recordedSampleNum (-1),
           sampleRate (0),
           testIsRunning (false),
diff --git a/modules/juce_audio_basics/buffers/juce_AudioSampleBuffer.cpp b/modules/juce_audio_basics/buffers/juce_AudioSampleBuffer.cpp
index 3addc5a193..72d7f0d93a 100644
--- a/modules/juce_audio_basics/buffers/juce_AudioSampleBuffer.cpp
+++ b/modules/juce_audio_basics/buffers/juce_AudioSampleBuffer.cpp
@@ -22,13 +22,20 @@
   ==============================================================================
 */
 
+AudioSampleBuffer::AudioSampleBuffer() noexcept
+  : numChannels (0), size (0), allocatedBytes (0),
+    channels (static_cast<float**> (preallocatedChannelSpace)),
+    isClear (false)
+{
+}
+
 AudioSampleBuffer::AudioSampleBuffer (const int numChans,
                                       const int numSamples) noexcept
   : numChannels (numChans),
     size (numSamples)
 {
     jassert (numSamples >= 0);
-    jassert (numChans > 0);
+    jassert (numChans >= 0);
 
     allocateData();
 }
@@ -63,7 +70,7 @@ void AudioSampleBuffer::allocateData()
     const size_t channelListSize = sizeof (float*) * (size_t) (numChannels + 1);
     allocatedBytes = (size_t) numChannels * (size_t) size * sizeof (float) + channelListSize + 32;
     allocatedData.malloc (allocatedBytes);
-    channels = reinterpret_cast <float**> (allocatedData.getData());
+    channels = reinterpret_cast<float**> (allocatedData.getData());
 
     float* chan = (float*) (allocatedData + channelListSize);
     for (int i = 0; i < numChannels; ++i)
@@ -83,7 +90,8 @@ AudioSampleBuffer::AudioSampleBuffer (float* const* dataToReferTo,
       size (numSamples),
       allocatedBytes (0)
 {
-    jassert (numChans > 0);
+    jassert (dataToReferTo != nullptr);
+    jassert (numChans >= 0);
     allocateChannels (dataToReferTo, 0);
 }
 
@@ -96,7 +104,8 @@ AudioSampleBuffer::AudioSampleBuffer (float* const* dataToReferTo,
       allocatedBytes (0),
       isClear (false)
 {
-    jassert (numChans > 0);
+    jassert (dataToReferTo != nullptr);
+    jassert (numChans >= 0);
     allocateChannels (dataToReferTo, startSample);
 }
 
@@ -104,7 +113,8 @@ void AudioSampleBuffer::setDataToReferTo (float** dataToReferTo,
                                           const int newNumChannels,
                                           const int newNumSamples) noexcept
 {
-    jassert (newNumChannels > 0);
+    jassert (dataToReferTo != nullptr);
+    jassert (newNumChannels >= 0);
 
     allocatedBytes = 0;
     allocatedData.free();
@@ -121,12 +131,12 @@ void AudioSampleBuffer::allocateChannels (float* const* const dataToReferTo, int
     // (try to avoid doing a malloc here, as that'll blow up things like Pro-Tools)
     if (numChannels < (int) numElementsInArray (preallocatedChannelSpace))
     {
-        channels = static_cast <float**> (preallocatedChannelSpace);
+        channels = static_cast<float**> (preallocatedChannelSpace);
     }
     else
     {
         allocatedData.malloc ((size_t) numChannels + 1, sizeof (float*));
-        channels = reinterpret_cast <float**> (allocatedData.getData());
+        channels = reinterpret_cast<float**> (allocatedData.getData());
     }
 
     for (int i = 0; i < numChannels; ++i)
@@ -171,7 +181,7 @@ void AudioSampleBuffer::setSize (const int newNumChannels,
                                  const bool clearExtraSpace,
                                  const bool avoidReallocating) noexcept
 {
-    jassert (newNumChannels > 0);
+    jassert (newNumChannels >= 0);
     jassert (newNumSamples >= 0);
 
     if (newNumSamples != size || newNumChannels != numChannels)
diff --git a/modules/juce_audio_basics/buffers/juce_AudioSampleBuffer.h b/modules/juce_audio_basics/buffers/juce_AudioSampleBuffer.h
index 2674ad048c..aef8850d91 100644
--- a/modules/juce_audio_basics/buffers/juce_AudioSampleBuffer.h
+++ b/modules/juce_audio_basics/buffers/juce_AudioSampleBuffer.h
@@ -34,6 +34,10 @@
 class JUCE_API  AudioSampleBuffer
 {
 public:
+    //==============================================================================
+    /** Creates an empty buffer with 0 channels and 0 length. */
+    AudioSampleBuffer() noexcept;
+
     //==============================================================================
     /** Creates a buffer with a specified number of channels and samples.
 
@@ -93,12 +97,12 @@ public:
         using an external data buffer, in which case boths buffers will just point to the same
         shared block of data.
     */
-    AudioSampleBuffer (const AudioSampleBuffer& other) noexcept;
+    AudioSampleBuffer (const AudioSampleBuffer&) noexcept;
 
     /** Copies another buffer onto this one.
         This buffer's size will be changed to that of the other buffer.
     */
-    AudioSampleBuffer& operator= (const AudioSampleBuffer& other) noexcept;
+    AudioSampleBuffer& operator= (const AudioSampleBuffer&) noexcept;
 
     /** Destructor.
         This will free any memory allocated by the buffer.
diff --git a/modules/juce_audio_basics/sources/juce_BufferingAudioSource.cpp b/modules/juce_audio_basics/sources/juce_BufferingAudioSource.cpp
index 827cd7be5e..21dc173a60 100644
--- a/modules/juce_audio_basics/sources/juce_BufferingAudioSource.cpp
+++ b/modules/juce_audio_basics/sources/juce_BufferingAudioSource.cpp
@@ -31,7 +31,6 @@ BufferingAudioSource::BufferingAudioSource (PositionableAudioSource* s,
       backgroundThread (thread),
       numberOfSamplesToBuffer (jmax (1024, bufferSizeSamples)),
       numberOfChannels (numChannels),
-      buffer (numChannels, 0),
       bufferValidStart (0),
       bufferValidEnd (0),
       nextPlayPos (0),
diff --git a/modules/juce_audio_basics/sources/juce_ChannelRemappingAudioSource.cpp b/modules/juce_audio_basics/sources/juce_ChannelRemappingAudioSource.cpp
index af408b10b6..7e0a58cb46 100644
--- a/modules/juce_audio_basics/sources/juce_ChannelRemappingAudioSource.cpp
+++ b/modules/juce_audio_basics/sources/juce_ChannelRemappingAudioSource.cpp
@@ -25,8 +25,7 @@
 ChannelRemappingAudioSource::ChannelRemappingAudioSource (AudioSource* const source_,
                                                           const bool deleteSourceWhenDeleted)
    : source (source_, deleteSourceWhenDeleted),
-     requiredNumberOfChannels (2),
-     buffer (2, 16)
+     requiredNumberOfChannels (2)
 {
     remappedInfo.buffer = &buffer;
     remappedInfo.startSample = 0;
diff --git a/modules/juce_audio_basics/sources/juce_MixerAudioSource.cpp b/modules/juce_audio_basics/sources/juce_MixerAudioSource.cpp
index f5a2f8fb05..60ae1919fe 100644
--- a/modules/juce_audio_basics/sources/juce_MixerAudioSource.cpp
+++ b/modules/juce_audio_basics/sources/juce_MixerAudioSource.cpp
@@ -23,9 +23,7 @@
 */
 
 MixerAudioSource::MixerAudioSource()
-    : tempBuffer (2, 0),
-      currentSampleRate (0.0),
-      bufferSizeExpected (0)
+   : currentSampleRate (0.0), bufferSizeExpected (0)
 {
 }
 
diff --git a/modules/juce_audio_basics/sources/juce_ResamplingAudioSource.cpp b/modules/juce_audio_basics/sources/juce_ResamplingAudioSource.cpp
index a48ed43e1e..52fc7302e8 100644
--- a/modules/juce_audio_basics/sources/juce_ResamplingAudioSource.cpp
+++ b/modules/juce_audio_basics/sources/juce_ResamplingAudioSource.cpp
@@ -28,14 +28,12 @@ ResamplingAudioSource::ResamplingAudioSource (AudioSource* const inputSource,
     : input (inputSource, deleteInputWhenDeleted),
       ratio (1.0),
       lastRatio (1.0),
-      buffer (numChannels_, 0),
       bufferPos (0),
       sampsInBuffer (0),
       subSampleOffset (0),
       numChannels (numChannels_)
 {
     jassert (input != nullptr);
-
     zeromem (coefficients, sizeof (coefficients));
 }
 
diff --git a/modules/juce_audio_devices/audio_io/juce_AudioDeviceManager.cpp b/modules/juce_audio_devices/audio_io/juce_AudioDeviceManager.cpp
index 8ab2096a38..e3584d9c85 100644
--- a/modules/juce_audio_devices/audio_io/juce_AudioDeviceManager.cpp
+++ b/modules/juce_audio_devices/audio_io/juce_AudioDeviceManager.cpp
@@ -95,7 +95,6 @@ AudioDeviceManager::AudioDeviceManager()
       useInputNames (false),
       inputLevel (0),
       testSoundPosition (0),
-      tempBuffer (2, 2),
       cpuUsageMs (0),
       timeToCpuScale (0)
 {
diff --git a/modules/juce_audio_devices/native/juce_mac_CoreAudio.cpp b/modules/juce_audio_devices/native/juce_mac_CoreAudio.cpp
index 9fb77ddb24..625f1b8083 100644
--- a/modules/juce_audio_devices/native/juce_mac_CoreAudio.cpp
+++ b/modules/juce_audio_devices/native/juce_mac_CoreAudio.cpp
@@ -1026,8 +1026,7 @@ public:
     AudioIODeviceCombiner (const String& deviceName)
         : AudioIODevice (deviceName, "CoreAudio"),
           Thread (deviceName), callback (nullptr),
-          currentSampleRate (0), currentBufferSize (0), active (false),
-          fifos (1, 1)
+          currentSampleRate (0), currentBufferSize (0), active (false)
     {
     }
 
diff --git a/modules/juce_audio_devices/native/juce_win32_DirectSound.cpp b/modules/juce_audio_devices/native/juce_win32_DirectSound.cpp
index d04902b628..9c43a1da08 100644
--- a/modules/juce_audio_devices/native/juce_win32_DirectSound.cpp
+++ b/modules/juce_audio_devices/native/juce_win32_DirectSound.cpp
@@ -731,8 +731,6 @@ public:
           isStarted (false),
           bufferSizeSamples (0),
           sampleRate (0.0),
-          inputBuffers (1, 1),
-          outputBuffers (1, 1),
           callback (nullptr)
     {
         if (outputDeviceIndex_ >= 0)
@@ -871,8 +869,8 @@ private:
     bool isStarted;
     String lastError;
 
-    OwnedArray <DSoundInternalInChannel> inChans;
-    OwnedArray <DSoundInternalOutChannel> outChans;
+    OwnedArray<DSoundInternalInChannel> inChans;
+    OwnedArray<DSoundInternalOutChannel> outChans;
     WaitableEvent startEvent;
 
     int bufferSizeSamples;
diff --git a/modules/juce_audio_devices/sources/juce_AudioSourcePlayer.cpp b/modules/juce_audio_devices/sources/juce_AudioSourcePlayer.cpp
index 45b2a3ad6c..c351795338 100644
--- a/modules/juce_audio_devices/sources/juce_AudioSourcePlayer.cpp
+++ b/modules/juce_audio_devices/sources/juce_AudioSourcePlayer.cpp
@@ -26,7 +26,6 @@ AudioSourcePlayer::AudioSourcePlayer()
     : source (nullptr),
       sampleRate (0),
       bufferSize (0),
-      tempBuffer (2, 8),
       lastGain (1.0f),
       gain (1.0f)
 {
diff --git a/modules/juce_audio_formats/codecs/juce_FlacAudioFormat.cpp b/modules/juce_audio_formats/codecs/juce_FlacAudioFormat.cpp
index 99c9fe105c..d9957565ef 100644
--- a/modules/juce_audio_formats/codecs/juce_FlacAudioFormat.cpp
+++ b/modules/juce_audio_formats/codecs/juce_FlacAudioFormat.cpp
@@ -104,7 +104,6 @@ class FlacReader  : public AudioFormatReader
 public:
     FlacReader (InputStream* const in)
         : AudioFormatReader (in, flacFormatName),
-          reservoir (2, 0),
           reservoirStart (0),
           samplesInReservoir (0),
           scanningForLength (false)
diff --git a/modules/juce_audio_formats/codecs/juce_OggVorbisAudioFormat.cpp b/modules/juce_audio_formats/codecs/juce_OggVorbisAudioFormat.cpp
index e6303dc818..9d9ace156d 100644
--- a/modules/juce_audio_formats/codecs/juce_OggVorbisAudioFormat.cpp
+++ b/modules/juce_audio_formats/codecs/juce_OggVorbisAudioFormat.cpp
@@ -106,7 +106,6 @@ class OggReader : public AudioFormatReader
 public:
     OggReader (InputStream* const inp)
         : AudioFormatReader (inp, oggFormatName),
-          reservoir (2, 4096),
           reservoirStart (0),
           samplesInReservoir (0)
     {
@@ -140,8 +139,7 @@ public:
             bitsPerSample = 16;
             sampleRate = info->rate;
 
-            reservoir.setSize ((int) numChannels,
-                               (int) jmin (lengthInSamples, (int64) reservoir.getNumSamples()));
+            reservoir.setSize ((int) numChannels, (int) jmin (lengthInSamples, (int64) 4096));
         }
     }
 
diff --git a/modules/juce_audio_processors/processors/juce_AudioProcessorGraph.cpp b/modules/juce_audio_processors/processors/juce_AudioProcessorGraph.cpp
index 0dd5a14fac..9ca46d2f7f 100644
--- a/modules/juce_audio_processors/processors/juce_AudioProcessorGraph.cpp
+++ b/modules/juce_audio_processors/processors/juce_AudioProcessorGraph.cpp
@@ -923,9 +923,7 @@ void AudioProcessorGraph::Node::setParentGraph (AudioProcessorGraph* const graph
 //==============================================================================
 AudioProcessorGraph::AudioProcessorGraph()
     : lastNodeId (0),
-      renderingBuffers (1, 1),
       currentAudioInputBuffer (nullptr),
-      currentAudioOutputBuffer (1, 1),
       currentMidiInputBuffer (nullptr)
 {
 }
diff --git a/modules/juce_audio_utils/players/juce_AudioProcessorPlayer.cpp b/modules/juce_audio_utils/players/juce_AudioProcessorPlayer.cpp
index 649406fa9d..721cf01464 100644
--- a/modules/juce_audio_utils/players/juce_AudioProcessorPlayer.cpp
+++ b/modules/juce_audio_utils/players/juce_AudioProcessorPlayer.cpp
@@ -28,8 +28,7 @@ AudioProcessorPlayer::AudioProcessorPlayer()
       blockSize (0),
       isPrepared (false),
       numInputChans (0),
-      numOutputChans (0),
-      tempBuffer (1, 1)
+      numOutputChans (0)
 {
 }