made controls have a track to allow automation of LADSPA-controls, compare out_sum against getGate()+0.0001f as getGate() might be 0 while out_sum in many cases never will reach 0,0...0 again - fixes high CPU-usage even after stop playing

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@817 0778d3d1-df1d-0410-868b-ea421aaaa00d

include/effect_chain.h

@@ -54,6 +54,11 @@ public:
 
 	void clear( void );
 
+	track * getTrack( void )
+	{
+		return( m_track );
+	}
+
 
 private:
 	typedef QVector<effect *> effectList;