Battlezone Sound Prob

I've got a weird problem that's been bugging me on my Battlezone mini for a
while now. Game plays fine. Problem is that the sound of the tank engine is
2-3 times louder than any of the other sounds and thus mostly drowns them out
(they are still slightly audible).

Looking at the schematic, I can't for the life of me see what could cause a
problem like this. Any ideas?

-- 
Dave Downin (dave@arlo.net)
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