I have been working on a 1979 Williams Flash machine.
I have been trying to tackle problems as they come up. The question I have now is with regards to the background sound. When I play it makes all the appropriate noises when it hits the targets, but it doesn't make the background sound. Watching videos online, it appears that it is supposed to make a humming sound that increases in pitch as the game progresses. My question is if maybe a past owner disabled this, or if there is a switch to turn it back on, where would I find it.
I did find the white plastic knob that adjusts volume, but since only the taeget sounds are working, that is all that is adjusted.
Thanks!