/** control owner; may be _route, or 0 if we are editing region-based automation */
boost::shared_ptr<ARDOUR::Automatable> _automatable;
/** controller owner; 0 if we are editing region-based automation */
boost::shared_ptr<AutomationController> _controller;
/** control owner; may be _route, or 0 if we are editing region-based automation */
boost::shared_ptr<ARDOUR::Automatable> _automatable;
/** controller owner; 0 if we are editing region-based automation */
boost::shared_ptr<AutomationController> _controller;