Does anyone know anything about USB Audio?

[CrashAlpha]

I am having a hard time solving my problems with Android Auto's USB Audio, and it turns out very few people know much about it.

Does anyone here know anything about it, or know of a forum where participants do know about it?

 

[kalnel#WN]

What does it do? I can use USB audio through my car's infotainment, but I don't see a way to use it once the phone is plugged in to Android Auto via USB.