Hey, this is a bit problematic, the Raspberry Pi itself is very sensitive to such things happening. You could start with verifying whether Pisound still works with another RPi, or if you don’t have one available, check whether the GPIOs in use by Pisound (https://blokas.io/pisound/docs/Specs/#raspberry-pi-pins-used-by-pisound) are working.
You’d have to configure them as output pins and set HIGH level to all of them, measure with a multimeter whether you get 3.3V readouts.
I’ve had some of the Raspberry Pi’s GPIO pins stop working from lesser accidents, so that’s why I consider it a very sensitive device.
We haven’t had Pisound stop working yet, but 5V shorted to GND could do damage to its circuitry…
Another thing you can check is the output of
dmesg. You may send one to me to take a look whether I can spot any software issues that could be solvable.