Remove unused stuff (#5685)

include/Engine.h

@@ -35,7 +35,6 @@
 #include "lmms_basics.h"
 
 class BBTrackContainer;
-class DummyTrackContainer;
 class FxMixer;
 class ProjectJournal;
 class Mixer;
@@ -102,11 +101,6 @@ public:
 		return s_ladspaManager;
 	}
 
-	static DummyTrackContainer * dummyTrackContainer()
-	{
-		return s_dummyTC;
-	}
-
 	static float framesPerTick()
 	{
 		return s_framesPerTick;
@@ -151,7 +145,6 @@ private:
 	static Song * s_song;
 	static BBTrackContainer * s_bbTrackContainer;
 	static ProjectJournal * s_projectJournal;
-	static DummyTrackContainer * s_dummyTC;
 
 #ifdef LMMS_HAVE_LV2
 	static class Lv2Manager* s_lv2Manager;

include/Mixer.h

@@ -173,8 +173,6 @@ public:
 
 	//! Set new audio device. Old device will be deleted,
 	//! unless it's stored using storeAudioDevice
-	void setAudioDevice( AudioDevice * _dev , bool startNow );
-	//! See overloaded function
 	void setAudioDevice( AudioDevice * _dev,
 				const struct qualitySettings & _qs,
 				bool _needs_fifo,

include/TrackContainer.h

@@ -115,30 +115,4 @@ private:
 } ;
 
 
-class DummyTrackContainer : public TrackContainer
-{
-public:
-	DummyTrackContainer();
-
-	virtual ~DummyTrackContainer()
-	{
-	}
-
-	QString nodeName() const override
-	{
-		return "DummyTrackContainer";
-	}
-
-	InstrumentTrack * dummyInstrumentTrack()
-	{
-		return m_dummyInstrumentTrack;
-	}
-
-
-private:
-	InstrumentTrack * m_dummyInstrumentTrack;
-
-} ;
-
-
 #endif