Audio over USB
Have a look for any documentation you can find on gadget audio - much as you can make the phone look like a network device to the PC, you can also make it look like an audio adapter. I've not tried it on the PinePhone but it works on a Pi Zero and Pi 4. I think the PinePhone distros are using the compound gadget interface, configured through sysfs somewhere.

It might be easier to do it over the network connection with PulseAudio:

Messages In This Thread
Audio over USB - by 3x5co - 01-02-2021, 08:06 PM
RE: Audio over USB - by wibble - 01-05-2021, 06:21 PM

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