Thanks for the input guys. Channel, since you seem to have a pretty good grasp on Ms. Pacman's sound issues, what would be my likeliest candidates for no sound on a working board? I've pulled and cleaned the 1M and 3M and replaced the 330uf cap, yet I still get the variable pot hum and nothing else, hence why I suspect its the lm377. I get no static when I touch the pins, yet I do get weird sounds when I touch the 3M pins, or the hum cuts out completely when touching them. Is there anything else I can do to check the sound?
I will also mention that I seem to have the humbar issue with my monitor, not sure if that would have any role in it, though the distortion is very faint and more like a slightly darker band moving left to right.