So, I have a xenon and get no background sound. I bought a rebuilt sound/speech board set from Ray who has a YouTube channel and it didn't help. Still no back ground sound. Funny thing is, when I bought the game and brought it home and first set it up, background tempo sound worked great. Then a rom vocal got garbled and no background sound. I'm confused by this because I have no problems with exit chamber switch or saucer. What could be the issue? Before you ask...both boards have all new caps and sound pots.