+ void check_record_layers (boost::shared_ptr<ARDOUR::Region>, ARDOUR::framepos_t);
+
+ virtual void playlist_layered (boost::weak_ptr<ARDOUR::Track>);
+
+ sigc::signal<void, RegionView*> RegionViewAdded;
+ sigc::signal<void> RegionViewRemoved;
+ /** Emitted when the height of regions has changed */
+ sigc::signal<void> ContentsHeightChanged;