I had this happening to me 2 weeks ago. Every time I pushed the start button on my AirTurn pedal, the iPad volume would decrease. Not the volume bar in Stage Traxx. I didn't understand what happened at first, and it took me some songs to catch what was happening. The whole night I had to keep turning the iPad up again. I was thinking somehow the AirTurn mode had changed. Have since changed my pedal, hoping this was a one off.