Weird audio issue

[F0LLETT]

I suspect your electrolytic capacitors have gone bad, they might have leaked as well, so look closely for damaged traces or components on the board.

Its not an A1200.

@OP, what model is it, standard A500 or an A500+. As plus has battery that trashing everything.
Best next action to re-seat all chips. Carefully lift them and push them back into place.

Despite what people say, 99% of A500 issues are caused by connection issues on chips.

[F0LLETT]

I wanted to let you know of my progress. I couldn't get to it until today but I tried what you suggested, reseating the chips. I pulled them, not all; just Paula and Gary, and sprayed the sockets with Deoxit D5. After plugging them back in I loaded Music Studio and, voila! It worked like a charm!
Thank you for your response and for knowing what to do. I would probably have tried it myself before giving up but I was afraid it would require a new Paula chip.
So thanks again,
Kenneth

Glad you got it all sorted.