ginacc No I cannot send them each individually to a mixer because I'm on a lighting iPad and the USB port from the camera adapter is already being used to send MIDI out for our video.)
Just on this point, you can get a Lightning adapter with 2 x USB ports so you aren't forced into using the Headphone output and being restricted to 2 mono tracks of output.
I think I might have similar setup as yourself.
In my case I have a 9th Gen iPad with Lightning port and I connect an adapter to give me:
- USB-A port - connects to our Behringer X32 mixer digital interface so I can send 5 audio tracks
- USB-A port - connects to a CME MIDI interface
- Lightning port - so I can run power to the iPad
it was just some cheap adapter I got on eBay or Amazon, but it works great.