I have a guided missile that I have replaced the Roms to Eproms and changed the jumpers for the Eproms. I don't have the left or 2nd player missile sound and the explosion sound is really distorted or muffled on both players. I changed the LM3900 at H4 for the left missile sound and it did not help. It was the same way when the original Roms where in the board. Anyone have any ideas for what it might be? Thanks