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

[GDJ]

Doesn't your Audio Interface have a software interface so you can send all the Inputs to one Main Stereo Pair L/R?

I have a MOTU Interface and use all 8 Inputs. The GUI software for it allows me to freely send all the Inputs to the Main out Bus.



Otherwise, it's common to use a mixer and send 2 channels to the AI