this will be a thing for me moving forward. Using one iPad as a sound source and running it into a second to be used as a FX pedal. The reason, ease the burden on DSP as I do not have an M chip iPad. It's super janky. It's super fun!
Building a system like this one would be fun already for me, even before the music starts. I like the tinkering. You are getting dangerously close to live jamming.