add the final virtual GhostRegion method to VelocityGhostRegion

gtk2_ardour/velocity_ghost_region.cc

@@ -117,3 +117,9 @@ VelocityGhostRegion::update_contents_height ()
 {
 	VelocityDisplay::redisplay ();
 }
+
+void
+VelocityGhostRegion::update_hit (GhostEvent* gev)
+{
+	update_note (gev);
+}

gtk2_ardour/velocity_ghost_region.h

@@ -43,6 +43,7 @@ class VelocityGhostRegion : public MidiGhostRegion, public VelocityDisplay
 	void note_selected (NoteBase*);
 	void update_note (GhostEvent*);
 	void update_contents_height ();
+	void update_hit (GhostEvent*);
 
 	ArdourCanvas::Rectangle& base_item();