Proposed fix for 1595 Instrument track activity LED lights when muted

include/FadeButton.h

@@ -39,6 +39,7 @@ public:
 					_activated_color, QWidget * _parent );
 
 	virtual ~FadeButton();
+	void setActiveColor( const QColor & activated_color );
 
 
 public slots:

include/InstrumentTrack.h

@@ -225,6 +225,7 @@ protected slots:
 	void updateBaseNote();
 	void updatePitch();
 	void updatePitchRange();
+	void muteHasChanged();
 
 
 private: