I acquired a FBC not to long ago and just got around to shopping it out and getting it running again. It looks very nice and seems to be playing fine but there is one thing I'm curious about. There is a pulsating type of background sound that plays constantly, even in attract mode - very annoying. Is this normal? I wouldn't think it was supposed to play in attract mode. If so, is there anyway to turn it off? I have found the service bulletin about dip switch 30 but it does not seem to make a difference. Any suggestions?