CAMILLA DSP tutorial with 8xIN+8xOUT

Good question, and not a dumb one at all.

In this tutorial, “2ch USB-in and 8ch out” means:

PC → USB → Raspberry Pi / CamillaDSP → 8 analog outputs

So the PC sends 2 audio channels to the Pi, and CamillaDSP can process/split them to 8 analog outputs, for example for active crossover use.

What you describe is the opposite direction, more like a USB audio interface:

8 analog inputs from the 8xIN+8xOUT → Raspberry Pi → USB → PC/DAW
and optionally:
PC stereo output → USB → Raspberry Pi → 2 analog outputs

This should be technically possible with the 8xIN+8xOUT, by creating a different USB Audio Gadget profile, for example 8-channel capture + 2-channel playback. From the PC point of view, it would appear as a USB audio interface with 8 recording inputs and 2 playback outputs.

It is not the mode documented in this tutorial yet

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