I just bought a Monopoly (2001) machine--there's lot's of noise coming through the speakers when not playing a game. The noise sounds like 60 cycle hum amped up, but the noise does change pitch/volume slightly as the general illumination goes through its cycle when the machine is in attract mode. My question is whether this is normal for a Stern machine (the person I bought it from says it is...)? This is my 1st experience with a Stern machine. My other machine is an Indiana Jones (Williams) and that has very little if any hum/white noise coming through the speakers when not in a game (at least that I can hear....).