One problem I have found with the PiSound card when plugged into a Pi4. It seems to disable rebooting of the Pi. If I do sudo reboot now it merely shuts down. Also in that case I have to disconnect the power supply and wait quite a time (around 30 secs) before I can plug it in a start the Pi4 again. Without the PiSound board plugged in to reboots normally. Other than that the hardware Works OK. I haven’t tested the button and other PiSound software install as I use the board mainly with Sonic Pi which I have built for source for the Pi4.