Just wanted to update this... Mike's suggested that I remove the kit and reinstall, and also to remove the rapid fire chip and put in the standard fire chip. Well, I didn't have a standard fire chip, so I ordered one from Mike's for 23 bucks shipped (!). Well, did I feel stupid when I went to change out the rapid fire chip and realized that it had already been replaced with a chip from the enhancement kit! I realize that I should have known about this myself, but I certainly think that Mike's should have pointed it out before I wasted $23 on a chip I don't need. The sounds are better now, but still not right, and the coin up sound comes and goes. If I take the kit out, everything returns to normal. I've found that if I change the dip switch settings on the pcb, that seems to have an effect on the sounds. Live and learn, I guess.