diff --git a/source/Makefile.mk b/source/Makefile.mk
index 791a7d3ba..f34c6e0a2 100644
--- a/source/Makefile.mk
+++ b/source/Makefile.mk
@@ -62,7 +62,7 @@ CFLAGS     += -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes
 CXXFLAGS   += -Wnon-virtual-dtor -Woverloaded-virtual
 ifeq ($(LINUX),true)
 CFLAGS     += -isystem /opt/kxstudio/include
-CXXFLAGS   += -isystem /opt/kxstudio/include -isystem /usr/include/qt5
+CXXFLAGS   += -isystem /opt/kxstudio/include -isystem /usr/include/qt4
 endif
 ifeq ($(MACOS),true)
 CFLAGS     += -isystem /opt/local/include/
@@ -70,7 +70,7 @@ CXXFLAGS   += -isystem /opt/local/include/
 endif
 ifeq ($(WIN32),true)
 CFLAGS     += -isystem /opt/mingw32/include
-CXXFLAGS   += -isystem /opt/mingw32/include -isystem /opt/mingw32/include/qt5
+CXXFLAGS   += -isystem /opt/mingw32/include -isystem /opt/mingw32/include/qt4
 endif
 endif
 
diff --git a/source/backend/plugin/JucePlugin.cpp b/source/backend/plugin/JucePlugin.cpp
index 9ac695f61..6e9db9138 100644
--- a/source/backend/plugin/JucePlugin.cpp
+++ b/source/backend/plugin/JucePlugin.cpp
@@ -30,7 +30,8 @@ using namespace juce;
 CARLA_BACKEND_START_NAMESPACE
 
 class JucePlugin : public CarlaPlugin,
-                   public AudioPlayHead
+                   public AudioPlayHead,
+                   public AudioProcessorListener
 {
 public:
     JucePlugin(CarlaEngine* const engine, const uint id)
@@ -890,6 +891,29 @@ public:
         for (uint32_t i=0; i < pData->audioOut.count; ++i)
             FloatVectorOperations::copy(outBuffer[i], fAudioBuffer.getSampleData(static_cast<int>(i)), static_cast<int>(frames));
 
+        // --------------------------------------------------------------------------------------------------------
+        // Midi out
+
+        if (! fMidiBuffer.isEmpty())
+        {
+            if (pData->event.portOut != nullptr)
+            {
+                const uint8* midiEventData;
+                int midiEventSize, midiEventPosition;
+
+                for (MidiBuffer::Iterator i(fMidiBuffer); i.getNextEvent(midiEventData, midiEventSize, midiEventPosition);)
+                {
+                    CARLA_SAFE_ASSERT_BREAK(midiEventPosition >= 0 && midiEventPosition < static_cast<int>(frames));
+                    CARLA_SAFE_ASSERT_BREAK(midiEventSize > 0);
+
+                    if (! pData->event.portOut->writeMidiEvent(static_cast<uint32_t>(midiEventPosition), static_cast<uint8_t>(midiEventSize), midiEventData))
+                        break;
+                }
+            }
+
+            fMidiBuffer.clear();
+        }
+
         // --------------------------------------------------------------------------------------------------------
 
         pData->singleMutex.unlock();
@@ -935,6 +959,17 @@ public:
     // -------------------------------------------------------------------
 
 protected:
+    void audioProcessorParameterChanged(AudioProcessor*, int /*parameterIndex*/, float /*newValue*/) override
+    {
+    }
+
+    void audioProcessorChanged(AudioProcessor*) override
+    {
+    }
+
+    void audioProcessorParameterChangeGestureBegin(AudioProcessor*, int) {}
+    void audioProcessorParameterChangeGestureEnd(AudioProcessor*, int) {}
+
     bool getCurrentPosition(CurrentPositionInfo& result) override
     {
         carla_copyStruct<CurrentPositionInfo>(result, fPosInfo);
@@ -1010,6 +1045,7 @@ public:
 
         fInstance->fillInPluginDescription(fDesc);
         fInstance->setPlayHead(this);
+        fInstance->addListener(this);
 
         // ---------------------------------------------------------------
         // get info
diff --git a/source/widgets/qgraphicsembedscene.py b/source/widgets/qgraphicsembedscene.py
index 2fd0e332c..b3407ed28 100644
--- a/source/widgets/qgraphicsembedscene.py
+++ b/source/widgets/qgraphicsembedscene.py
@@ -102,12 +102,12 @@ class QGraphicsEmbedScene(QGraphicsScene):
         # Render the scene into the fbo, scaling the QPainter's view
         # transform up to the power-of-two fbo size.
         painter = QPainter(self.fbo)
-        painter.setWindow(0, 0, size.width(), size.height());
-        painter.setViewport(0, 0, fboSize.width(), fboSize.height());
+        painter.setWindow(0, 0, size.width(), size.height())
+        painter.setViewport(0, 0, fboSize.width(), fboSize.height())
         self.render(painter)
         painter.end()
         self.dirty = False
-        return self.fbo.texture();
+        return self.fbo.texture()
 
     def deliverEvent(self, event, texCoord):
         # Map the texture co-ordinate into "screen" co-ordinates.
@@ -140,78 +140,78 @@ class QGraphicsEmbedScene(QGraphicsScene):
                          QEvent.GraphicsSceneMouseDoubleClick):
             pass
             #QGraphicsSceneMouseEvent *ev =
-                #static_cast<QGraphicsSceneMouseEvent *>(event);
-            #QGraphicsSceneMouseEvent e(ev->type());
-            #e.setPos(QPointF(screenX, screenY));
-            #e.setScenePos(QPointF(screenX + bounds.x(), screenY + bounds.y()));
-            #e.setScreenPos(QPoint(screenX, screenY));
-            #e.setButtonDownScreenPos(ev->button(), d->pressedPos);
+                #static_cast<QGraphicsSceneMouseEvent *>(event)
+            #QGraphicsSceneMouseEvent e(ev->type())
+            #e.setPos(QPointF(screenX, screenY))
+            #e.setScenePos(QPointF(screenX + bounds.x(), screenY + bounds.y()))
+            #e.setScreenPos(QPoint(screenX, screenY))
+            #e.setButtonDownScreenPos(ev->button(), d->pressedPos)
             #e.setButtonDownScenePos
                 #(ev->button(), QPointF(d->pressedPos.x() + bounds.x(),
-                                      #d->pressedPos.y() + bounds.y()));
-            #e.setButtons(ev->buttons());
-            #e.setButton(ev->button());
-            #e.setModifiers(ev->modifiers());
-            #e.setAccepted(false);
-            #QApplication::sendEvent(this, &e);
+                                      #d->pressedPos.y() + bounds.y()))
+            #e.setButtons(ev->buttons())
+            #e.setButton(ev->button())
+            #e.setModifiers(ev->modifiers())
+            #e.setAccepted(false)
+            #QApplication::sendEvent(this, &e)
 
         elif eventType == QEvent.GraphicsSceneWheel:
             pass
             #QGraphicsSceneWheelEvent *ev =
-                #static_cast<QGraphicsSceneWheelEvent *>(event);
-            #QGraphicsSceneWheelEvent e(QEvent::GraphicsSceneWheel);
-            #e.setPos(QPointF(screenX, screenY));
-            #e.setScenePos(QPointF(screenX + bounds.x(), screenY + bounds.y()));
-            #e.setScreenPos(QPoint(screenX, screenY));
-            #e.setButtons(ev->buttons());
-            #e.setModifiers(ev->modifiers());
-            #e.setDelta(ev->delta());
-            #e.setOrientation(ev->orientation());
-            #e.setAccepted(false);
-            #QApplication::sendEvent(this, &e);
+                #static_cast<QGraphicsSceneWheelEvent *>(event)
+            #QGraphicsSceneWheelEvent e(QEvent::GraphicsSceneWheel)
+            #e.setPos(QPointF(screenX, screenY))
+            #e.setScenePos(QPointF(screenX + bounds.x(), screenY + bounds.y()))
+            #e.setScreenPos(QPoint(screenX, screenY))
+            #e.setButtons(ev->buttons())
+            #e.setModifiers(ev->modifiers())
+            #e.setDelta(ev->delta())
+            #e.setOrientation(ev->orientation())
+            #e.setAccepted(false)
+            #QApplication::sendEvent(this, &e)
 
         elif eventType in (QEvent.MouseButtonPress,
                            QEvent.MouseButtonRelease,
                            QEvent.MouseButtonDblClick,
                            QEvent.MouseMove):
             pass
-            #QMouseEvent *ev = static_cast<QMouseEvent *>(event);
-            #QEvent::Type type;
+            #QMouseEvent *ev = static_cast<QMouseEvent *>(event)
+            #QEvent::Type type
             #if (ev->type() == QEvent::MouseButtonPress)
-                #type = QEvent::GraphicsSceneMousePress;
+                #type = QEvent::GraphicsSceneMousePress
             #else if (ev->type() == QEvent::MouseButtonRelease)
-                #type = QEvent::GraphicsSceneMouseRelease;
+                #type = QEvent::GraphicsSceneMouseRelease
             #else if (ev->type() == QEvent::MouseButtonDblClick)
-                #type = QEvent::GraphicsSceneMouseDoubleClick;
+                #type = QEvent::GraphicsSceneMouseDoubleClick
             #else
-                #type = QEvent::GraphicsSceneMouseMove;
-            #QGraphicsSceneMouseEvent e(type);
-            #e.setPos(QPointF(screenX, screenY));
-            #e.setScenePos(QPointF(screenX + bounds.x(), screenY + bounds.y()));
-            #e.setScreenPos(QPoint(screenX, screenY));
-            #e.setButtonDownScreenPos(ev->button(), d->pressedPos);
+                #type = QEvent::GraphicsSceneMouseMove
+            #QGraphicsSceneMouseEvent e(type)
+            #e.setPos(QPointF(screenX, screenY))
+            #e.setScenePos(QPointF(screenX + bounds.x(), screenY + bounds.y()))
+            #e.setScreenPos(QPoint(screenX, screenY))
+            #e.setButtonDownScreenPos(ev->button(), d->pressedPos)
             #e.setButtonDownScenePos
                 #(ev->button(), QPointF(d->pressedPos.x() + bounds.x(),
-                                      #d->pressedPos.y() + bounds.y()));
-            #e.setButtons(ev->buttons());
-            #e.setButton(ev->button());
-            #e.setModifiers(ev->modifiers());
-            #e.setAccepted(false);
-            #QApplication::sendEvent(this, &e);
+                                      #d->pressedPos.y() + bounds.y()))
+            #e.setButtons(ev->buttons())
+            #e.setButton(ev->button())
+            #e.setModifiers(ev->modifiers())
+            #e.setAccepted(false)
+            #QApplication::sendEvent(this, &e)
 
         elif eventType == QEvent.Wheel:
             pass
-            #QWheelEvent *ev = static_cast<QWheelEvent *>(event);
-            #QGraphicsSceneWheelEvent e(QEvent::GraphicsSceneWheel);
-            #e.setPos(QPointF(screenX, screenY));
-            #e.setScenePos(QPointF(screenX + bounds.x(), screenY + bounds.y()));
-            #e.setScreenPos(QPoint(screenX, screenY));
-            #e.setButtons(ev->buttons());
-            #e.setModifiers(ev->modifiers());
-            #e.setDelta(ev->delta());
-            #e.setOrientation(ev->orientation());
-            #e.setAccepted(false);
-            #QApplication::sendEvent(this, &e);
+            #QWheelEvent *ev = static_cast<QWheelEvent *>(event)
+            #QGraphicsSceneWheelEvent e(QEvent::GraphicsSceneWheel)
+            #e.setPos(QPointF(screenX, screenY))
+            #e.setScenePos(QPointF(screenX + bounds.x(), screenY + bounds.y()))
+            #e.setScreenPos(QPoint(screenX, screenY))
+            #e.setButtons(ev->buttons())
+            #e.setModifiers(ev->modifiers())
+            #e.setDelta(ev->delta())
+            #e.setOrientation(ev->orientation())
+            #e.setAccepted(false)
+            #QApplication::sendEvent(this, &e)
 
         #else:
             # Send the event directly without any conversion.