Currently using Stage Traxx 3 on my iPad. Sending backing tracks audio out through the headphone jack to a mixer via direct box, and sending midi commands to my Line 6 HX Stomp via the lightning port over USB. Midi works great, but the audio is also being transmitted over the USB to the HX Stomp and merged with my guitar output. How can I suppress the audio from being sent through the USB? It is preempting the audio out through the headphone jack. Not sure if there is a setting in the Stage Traxx 3 app or my iPad; haven't been able to find one in either place. Help!