If you own a 1100 or 1110 or 5000 or 10000, bypass the supply pins of the DIT chip YM3613 with a good 1µF film cap and also the corresponding 74HCXX.
There is a small BG cap except in 1110 and 5000, if you have a bigger one, add /replace it.
Sound gets even better.
1100 is better than 1110.
Best stay away from the PCM58 models like 1120.
There is a small BG cap except in 1110 and 5000, if you have a bigger one, add /replace it.
Sound gets even better.
1100 is better than 1110.
Best stay away from the PCM58 models like 1120.