I had this issue on my Pin-Bot. I added a pot on the red wire of the input harness from the daughter board to the sound board and it took care of the loudness issues from the sounds from the MPU daughter board. But my helicopter noise is still there. Not as loud, but it's still there. Rotten Dog sent me a new chip for the board (not sure which one), and when it didn't work they basically shrugged and said sorry. I bought the game with the MPU already in there, so i didn't raise too much of a stink with them since i wasn't the original owner of the board, but with all the same issues people are having, i was hoping for more of a roll of the dice then a shoulder shrug.