Merge pull request #1710 from curlymorphic/i1595

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

@@ -320,6 +320,7 @@ private slots:
 	void midiInSelected();
 	void midiOutSelected();
 	void midiConfigChanged();
+	void muteChanged();
 
 
 private: