[SOLVED] Hardware Volume on RPi DigiAMP+ and DAC Pro

[tropappar]

I also ran the commands you mention directly. I get the same error, regardless of setting it to high or low:

Code:

gpioset: error setting the GPIO line values: Device or resource busy

I also tried changing the audio device to IQaudIO but still no luck.

What I noticed: The mute LED is on but as I soon as I start playing something, it turns off (both for IQaudIO and RPi). But still, no audio output.

If none of the above works its not obvious to me what might be happening on your end.

Well, same for me  

I did a fresh install through RPi's imager. I only changed network, user, and audio config as posted in the screenshot and enabled Spotify renderer.