Is there a way to use mix of outputs of interface instead of separate channels?

[GDJ]

I maxed out my 8 channel MOTU mixer, and the AI software allows me to mix all 8 (4 stereo pairs), to a stereo buss. Additionally, in jk, even though you have multiple inputs, it will only support 2 output. And, even though under live tracks you see all your stereo pairs as tracks, other attendees of the session will see only one track for you.