+ PBD::ScopedConnectionList playlist_connections;
+ PBD::ScopedConnection playlist_switched_connection;
+
+ ARDOUR::layer_t _layers;
+ LayerDisplay _layer_display;
+
+ double height;
+
+ PBD::ScopedConnectionList rec_data_ready_connections;
+ nframes_t last_rec_data_frame;
+
+private:
+ void update_coverage_frames ();