Now I have
A: Desktop PC with Arch Linux
B: Raspberry Pi 3 with Raspbian Buster connected with a speaker
and I'd like to use
B as a wired speaker of
A. By "wired", I mean that
B are connected via a USB cable or an 3.5mm audio cable (but not via bluetooth).
Is it possible? I can find many explanations how to use a Raspberry Pi as a bluetooth speaker, but cannot find the wired version.