Audio over USB

[wibble]

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:
https://www.freedesktop.org/wiki/Softwar...r/Network/