I would only be guessing here, Mame really is not my thing...But on original hardware that was run through a pokey chip, and would have to almost bet that was next to impossible to duplicate,, since not all games were run the same and as result more than likey patched best they could...Again I am guessing, but there just is not two ways around that from what I can see, and as result some games, or parts of games the sound is off.