Sounds like your default volume has been saved as 0, which re-flashing to a different firmware version may fix but is more of a feature than a bug. ( Although they do say a bug is a feature which can't be turned off )
If you connect to your Picade over serial using the Arduino IDE or otherwise, ramp up the volume to the desired level by sending plusses: ++++ and then save the config by sending s it should get you back to sanity.