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SoundSync
With newer MAME versions there can be problems with stuttering sound if you use vsync or tripplebuffer. Thats because of the emulation gets slowed down and there aren't enough sound samples generated.

SoundSync changes the playback rate of the soundbuffer based on the emulations speed.
If Pac-Man runs with a speed of 98%, the soundbuffer playback gets slowed down to 98% also eliminating the stuttering. However note that the sound also gets a little pitched and slowed down, although most people won't hear this at all. This also works with games that run too fast (NeoGeo for example).