Hi. I’m building a cabinet around a Pi 3B and a Picade Hat (original version, not X). So far everything is working fine except the volume buttons. I soldered pushbuttons to the GPIO 13 and 26 pads on the Hat (and ground ofc).
Audio works fine through the Hat, but the volume controls do not. They have no effect in Emulationstation or within Retroarch (lr-mame2003). I am using Retropie 4.4
Any idea what to check/how to fix?