+ boost::shared_ptr<TransportControllable> roll_controllable;
+ boost::shared_ptr<TransportControllable> stop_controllable;
+ boost::shared_ptr<TransportControllable> goto_start_controllable;
+ boost::shared_ptr<TransportControllable> goto_end_controllable;
+ boost::shared_ptr<TransportControllable> auto_loop_controllable;
+ boost::shared_ptr<TransportControllable> play_selection_controllable;
+ boost::shared_ptr<TransportControllable> rec_controllable;
+