USB-C headphones for phones have their own audio interfaces, yep. Headsets and webcams have usb audio interfaces too. Also, I guess there are a good bunch of d

USB-C headphones for phones have their own audio interfaces, yep. Headsets and webcams have usb audio interfaces too. Also, I guess there are a good bunch of devices that have audio interfaces that, internally, might be connected to the USB bus. But I'm also thinking about sound "processing" oriented hardware that could run Linux. Sound recorders, mixers, synths, smart speakers... that could be based on an SBC or an ARM or similar processor.