diff --git a/include/midi_port.h b/include/midi_port.h
index 2128e1a1b..4a73a2e7f 100644
--- a/include/midi_port.h
+++ b/include/midi_port.h
@@ -81,23 +81,27 @@ public:
 
 	void setName( const QString & _name );
 
-	inline Modes mode( void ) const
+	inline Modes mode() const
 	{
-		return( m_mode );
+		return m_mode;
 	}
 
 	void setMode( Modes _mode );
 
-	inline bool inputEnabled( void ) const
+	inline bool inputEnabled() const
 	{
-		return( mode() == Input || mode() == Duplex );
+		return mode() == Input || mode() == Duplex;
 	}
 
-	inline bool outputEnabled( void ) const
+	inline bool outputEnabled() const
 	{
-		return( mode() == Output || mode() == Duplex );
+		return mode() == Output || mode() == Duplex;
 	}
 
+	inline int realOutputChannel() const
+	{
+		return outputChannel() - 1;
+	}
 
 	void processInEvent( const midiEvent & _me, const midiTime & _time );
 	void processOutEvent( const midiEvent & _me, const midiTime & _time );
@@ -106,9 +110,9 @@ public:
 	virtual void saveSettings( QDomDocument & _doc, QDomElement & _parent );
 	virtual void loadSettings( const QDomElement & _this );
 
-	virtual QString nodeName( void ) const
+	virtual QString nodeName() const
 	{
-		return( "midiport" );
+		return "midiport";
 	}
 
 	void subscribeReadablePort( const QString & _port,
@@ -116,19 +120,19 @@ public:
 	void subscribeWritablePort( const QString & _port,
 						bool _subscribe = TRUE );
 
-	const map & readablePorts( void ) const
+	const map & readablePorts() const
 	{
-		return( m_readablePorts );
+		return m_readablePorts;
 	}
 
-	const map & writablePorts( void ) const
+	const map & writablePorts() const
 	{
-		return( m_writablePorts );
+		return m_writablePorts;
 	}
 
-	void unsubscribeAllReadablePorts( void );
-	void unsubscribeAllWriteablePorts( void );
-	inline void unsubscribeAllPorts( void )
+	void unsubscribeAllReadablePorts();
+	void unsubscribeAllWriteablePorts();
+	inline void unsubscribeAllPorts()
 	{
 		unsubscribeAllReadablePorts();
 		unsubscribeAllWriteablePorts();
@@ -139,13 +143,13 @@ public:
 
 
 public slots:
-	void updateMidiPortMode( void );
+	void updateMidiPortMode();
 
 
 private slots:
-	void updateReadablePorts( void );
-	void updateWritablePorts( void );
-	void updateOutputProgram( void );
+	void updateReadablePorts();
+	void updateWritablePorts();
+	void updateOutputProgram();
 
 
 private:
@@ -173,9 +177,9 @@ private:
 
 
 signals:
-	void readablePortsChanged( void );
-	void writablePortsChanged( void );
-	void modeChanged( void );
+	void readablePortsChanged();
+	void writablePortsChanged();
+	void modeChanged();
 
 
 } ;
diff --git a/src/core/midi/midi_port.cpp b/src/core/midi/midi_port.cpp
index 2bf829220..1247a99cb 100644
--- a/src/core/midi/midi_port.cpp
+++ b/src/core/midi/midi_port.cpp
@@ -152,7 +152,7 @@ void midiPort::processInEvent( const midiEvent & _me, const midiTime & _time )
 void midiPort::processOutEvent( const midiEvent & _me, const midiTime & _time )
 {
 	// mask event
-	if( outputEnabled() && outputChannel() == _me.m_channel )
+	if( outputEnabled() && realOutputChannel() == _me.m_channel )
 	{
 		midiEvent ev = _me;
 		// we use/display MIDI channels 1...16 but we need 0...15 for
@@ -422,7 +422,7 @@ void midiPort::updateWritablePorts( void )
 void midiPort::updateOutputProgram( void )
 {
 	processOutEvent( midiEvent( MidiProgramChange,
-					outputChannel(),
+					realOutputChannel(),
 					outputProgram()-1 ), midiTime( 0 ) );
 }
 
diff --git a/src/core/note_play_handle.cpp b/src/core/note_play_handle.cpp
index ab4cddaae..78be2b1b3 100644
--- a/src/core/note_play_handle.cpp
+++ b/src/core/note_play_handle.cpp
@@ -1,5 +1,3 @@
-#ifndef SINGLE_SOURCE_COMPILE
-
 /*
  * note_play_handle.cpp - implementation of class notePlayHandle, part of
  *                        rendering engine
@@ -106,7 +104,7 @@ notePlayHandle::notePlayHandle( instrumentTrack * _it,
 	{
 		// send MIDI-note-on-event
 		m_instrumentTrack->processOutEvent( midiEvent( MidiNoteOn,
-			m_instrumentTrack->getMidiPort()->outputChannel(),
+			m_instrumentTrack->getMidiPort()->realOutputChannel(),
 			key(), getMidiVelocity() ),
 				midiTime::fromFrames( offset(),
 						engine::framesPerTick() ) );
@@ -153,7 +151,7 @@ void notePlayHandle::setVolume( const volume_t _volume )
 {
 	note::setVolume( _volume );
 	m_instrumentTrack->processOutEvent( midiEvent( MidiKeyPressure,
-			m_instrumentTrack->getMidiPort()->outputChannel(),
+			m_instrumentTrack->getMidiPort()->realOutputChannel(),
 						key(), getMidiVelocity() ), 0 );
 	
 }
@@ -331,7 +329,7 @@ void notePlayHandle::noteOff( const f_cnt_t _s )
 	{
 		// send MIDI-note-off-event
 		m_instrumentTrack->processOutEvent( midiEvent( MidiNoteOff,
-			m_instrumentTrack->getMidiPort()->outputChannel(),
+			m_instrumentTrack->getMidiPort()->realOutputChannel(),
 								key(), 0 ),
 			midiTime::fromFrames( m_framesBeforeRelease,
 						engine::framesPerTick() ) );
@@ -518,6 +516,3 @@ void notePlayHandle::resize( const bpm_t _new_tempo )
 }
 
 
-
-
-#endif
diff --git a/src/tracks/instrument_track.cpp b/src/tracks/instrument_track.cpp
index b7d6101d9..ba00c2836 100644
--- a/src/tracks/instrument_track.cpp
+++ b/src/tracks/instrument_track.cpp
@@ -369,11 +369,12 @@ void instrumentTrack::processOutEvent( const midiEvent & _me,
 				if( m_runningMidiNotes[k] > 0 )
 				{
 					m_instrument->handleMidiEvent(
-	midiEvent( MidiNoteOff, getMidiPort()->outputChannel(), k, 0 ), _time );
+	midiEvent( MidiNoteOff, getMidiPort()->realOutputChannel(), k, 0 ),
+									_time );
 				}
 				++m_runningMidiNotes[k];
 				m_instrument->handleMidiEvent(
-	midiEvent( MidiNoteOn, getMidiPort()->outputChannel(), k,
+	midiEvent( MidiNoteOn, getMidiPort()->realOutputChannel(), k,
 						_me.velocity() ), _time );
 			}
 			break;
@@ -389,7 +390,8 @@ void instrumentTrack::processOutEvent( const midiEvent & _me,
 						--m_runningMidiNotes[k] <= 0 )
 			{
 				m_instrument->handleMidiEvent(
-	midiEvent( MidiNoteOff, getMidiPort()->outputChannel(), k, 0 ), _time );
+	midiEvent( MidiNoteOff, getMidiPort()->realOutputChannel(), k, 0 ),
+									_time );
 			}
 			break;
 
@@ -542,7 +544,7 @@ void instrumentTrack::updatePitch( void )
 {
 	updateBaseNote();
 	processOutEvent( midiEvent( MidiPitchBend,
-					getMidiPort()->outputChannel(),
+					getMidiPort()->realOutputChannel(),
 					midiPitch() ), 0 );
 }