Stuttering is almost always because the game isn't running at full 100% speed.
This can be because your pc isn't fast enough to run full speed or because a vsync issue is making the game run slightly too fast or slightly too slow. i.e forcing a game with a 60.1Hz refresh rate to 59.94Hz.
Press f11 to when running the games to see if you're at 100% all the time.
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Re: Sound Stuttering in MAME.
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