I would be very grateful for any help with this - I hope - basic request. I have created a stage setting with zone 1 piano and zone 2 drawbar organ. There are no splits because the live performance of the song requires both instruments across a range of octaves. My question is this: how can I instantly toggle between the piano and organ in the live performance of this song at the touch of a button? On stage, I don't have time to press the zone -/+ buttons to disable the piano in zone 1, then zone + to enter the drawbar organ zone, then zone -/+ buttons to enable the organ. Is there a simple way instantly to toggle between the sounds assigned to zones with a single button?