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Smaller the sound buffer, smaller the delay but sound problems can happen more regularly (too many variables, host cpu speed, windows version, sound card, sound card driver etc..)
VSync makes syncing more difficult. "Bonus" feature is 100% CPU usage because most/all display drivers busy loop while waiting for vsync..
Vsync on: sound is synced to video. Requires very exact sound timing (or bigger buffer)
Vsync off: sound and video is synced to 'clock'. "Sync" is quite relaxed, nobody notices if framerate isn't exactly 50fps, everyone notices if sound pops or breaks.
(Sync means "external" video/sound sync. Emulated program don't see any difference.)
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