It seems like such an obvious solution now I think of it! Thanks so much for replying!

edit: I don’t think I was clear enough in the original post.
Basically, I want to use it like a multi-track

I have 2 drum machines coming in the L & R inputs (both mono)
one drum machine going to track 1
another drum machine going to track 2
AND I’ll have another instrument on track 3 from the AF

Basically, I need to send out 3 different outputs to Ableton.

If I was sending the AF instrument through the headphones, I’m sure the L & R outputs will be mixed in with the headphone audio. I’d end up with the L output in the left of the headphones etc

It’s no problem sending two channels but I’m not sure about the third.