last time I checked, there was an issue with the “vc4-hdmi” audio device on raspberry pi OS (i think it’s a kernel graphics driver bug, or something like that) …
this device works on the desktop via pulseaudio, but it does not work as an alsa device (which is how you’re trying to use it with Plexamp)
and pulseaudio is not usable when plexamp is run as a system service
you can either continue using the vc4-hdmi audio device + set up plexamp to run as a user service …
or, you can modify the kernel graphics driver/firmware settings to enable an audio device that’s usable with alsa (and plexamp as a system service)
details discussed here …
@odinb1 recently I tried the HDMI config changes included in your installer, at least in my case I still had issues with HDMI audio via alsa … let me know if you have other suggestions
