Nibbler - sound fault

Solder

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Does anyone have any experience repairing Nibbler boards?

I have one that works fine except for the sound - it plays some sounds but slowly, plus they are distorted and generally 'wrong'.

Before I got hold of the boardset all of the chips in the sound section had been replaced, including the SN76477.

Also, bearing in mind that this is an original, where on earth is the sound CPU??? I see no mention of it on the schematics and no sign of it on the board - MAME says it's an SNK 6502 custom:

http://maws.mameworld.info/maws/romset/nibbler

but I have no idea where it is on the boards. I'm either going mad or blind!
 
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