No Sound on Spy Hunter

NeP

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Can anyone tell me what voltage the lines labeled L and M are supposed to be going from the Power Supply to the Dual Amp board?

I have hooked up all the other lines from connectors 4 and 5 on the Power Supply to a switcher, and the game boots fine. But I can't find the schematic for the Power Supply, so I am not sure what voltage they are supposed to be. I am assuming this is why there is no sound right now.

It also might be because the +12V coming out of my switcher is over 13V, because I had to crank it up to get the +5V at a good level.

Attached are the lines I am asking about.
 

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they're 12v and gnd - or thereabouts. the amps are rated upto 18v iirc, so being a bit over +12 won't hurt a thing.
 
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