*/
virtual boost::shared_ptr<AutomationControl> send_level_controllable (uint32_t n) const = 0;
virtual boost::shared_ptr<AutomationControl> send_enable_controllable (uint32_t n) const = 0;
+ virtual boost::shared_ptr<AutomationControl> send_pan_azi_controllable (uint32_t n) const = 0;
/* for the same value of @param n, this returns the name of the send
* associated with the pair of controllables returned by the above two methods.