How to turn off attract music on Multi Jamma board

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Can anyone tell me how to turn off the annoying music that plays on the
"Game Never Over" 39 in 1 multi Jamma board? The booklet that came
with the board says you can turn off the Demo sound by toggling one of
the adjustments within the first adjustment menu, which I've done. The
music is always present when in Free play mode, and comes on as soon as
there's a credit in Coin play mode. I just want to be able to leave
this game in Free play mode and have it be quiet unless it's being
played.. Any suggestions?
Thanks
Vinny

 

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Archived from groups: rec.games.video.arcade.collecting (More info?)

I have a 9-in-1 also, and I HATE the music. I just put in a credit or
two at a time and leave the coindoor open so I can flick the credit
switch as needed. I don't know whose idea it was to put that God-awful
music in there, but they should be fired. And no, you cannot turn it
off, at least not with dip switches....I don't know about actually
hacking the board.