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

[tropappar]

These AMP hats might be muted by default like the old IQaudIO units.

Yes, you're right. The mute LED is on.

Try this command

Code:

sudo /var/www/util/sysutil.sh unmute-pi-digiampplus

It returns

Code:

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

I also tried setting it RPi.GPIO library but it returns

Code:

lgpio.error: 'GPIO not allocated'

I found some info in IQaudIO's user guide (see attachment). But I'm not quite sure how to apply it.