Distorted music and noise in Double Dragon 2

[pacoarcade]

Hi, I came across a Double Dragon 2 copy. It works fine but the music sounds heavily distorted, specially in some tunes, and there is an annoying background buzzing noise.

Maybe the YM3012? the opamp? bad caps?

https://vocaroo.com/buAtVK1qOIZ
https://vocaroo.com/hJsa5aomlfl

 

[Trol]

I would start with the caps.

 

[pacoarcade]

Fixed! the problem was caused by a bad opamp. I've recapped the board anyway (some capacitors were out of spec)