Multi-Cam sync on audio vs inpoints

I have been following several links on the world wide web  on PP CC multi cam functionality.
In all of my research I caught a 32 milli-second snippet of of someone speaking while demonstrating Multicam where he something to the effect that using audio to sync video clips for the purpose of performing multi cam editing KEEPS the video clips in sync. No elaboration of any kind was said on this subject.
It seems to me that a 2 hour dance recital that I will doing a two camera shoot of can certainly "Drift" out of sync from the sync point that will be at the beginning of each clip, EG camera flash or hand clap.
I do not know what the time base in a typical camera is based on. I am guessing that a crystal controled oscillator running at several megacycles is what is used, but that is only a guess.
HOWEVER,
If PP is keeping the clips in sync by ALWAYS looking at audio, then using audio to sync video clips is a Superior method over anything else. Besides, if a camera is accidently powered off / on you have nothing to do in terms of re syncing the cameras.
I just wish that there was more information about using audio for syncing clips in multi cam editing.
If anyone can elaborate on this subject I would very much appreciate it.
Thanks

It seems to me that a 2 hour dance recital that I will doing a two camera shoot of can certainly "Drift" out of sync from the sync point
That's certainly not normal.  I'm not sure why you'd think it is.
Personally, I find manually syncing to be faster than PP's audio sync.

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