Can any Qu-PAC owners help?

I am not great with mixers, so this thing is blowing my mind a bit. The reference guide seems to assume you understand all the concepts already. Anyway, I pretty much have it how I want it, but I want to stream my DAW back to the Qu-PAC over USB. When it says 32x32 USB interface, does that assume you have expanded the Qu-PAC’s inputs? Namely, I want to stream back audio from my DAW, but does that mean I have to leave a pair of physical inputs free on the mixer in order to do this?

Apologies that this is doubtless an idiot’s question.

A post was merged into an existing topic: Finally, the perfect mixer? [Allen & Heath QuPac]