boost::shared_ptr<PannerShell> panner_shell() const;
boost::shared_ptr<AutomationControl> gain_control() const;
boost::shared_ptr<Pannable> pannable() const;
boost::shared_ptr<PannerShell> panner_shell() const;
boost::shared_ptr<AutomationControl> gain_control() const;
boost::shared_ptr<Pannable> pannable() const;