+ boost::shared_ptr<PBD::Controllable> get_position_controllable() const { return position_control; }
+ boost::shared_ptr<PBD::Controllable> get_width_controllable() const { return width_control; }
+
+ sigc::signal<void> StartPositionGesture;
+ sigc::signal<void> StopPositionGesture;
+ sigc::signal<void> StartWidthGesture;
+ sigc::signal<void> StopWidthGesture;
+