Hi Michael, I have a similar (I think) problem. I send audio out of my Mac app to the “Qu-16 Audio” device – this is the USB cable between the Mac and the Qu. Audio always goes out on USB audio channels 1 & 2. But I want them to be assigned to channels 7 & 8 on the mixer. I don’t think there is a way to do this in the Qu itself. But I’m finding it nearly impossible to send the app’s audio to USB channels 7 & 8, which DO map to mixer channels 7 & 8.
Have you solved your problem?
Best,
Jon P