Channel One wrote in post #15580540
That decision would be based upon the distance from the source of the audio to the camera, if the distance is short then yes the on-board microphone can be used, now if there is a considerable distance between the source and the camera, there will be a delay between what is being videoed and the audio being recorded due to the difference between the speed of light and the speed of sound. For example lets say the camera is 200 hundred feet from the stage (quite possible in a concert setting) then the audio being recorded by the camera is lagging the video by 2/10ths of a second, go a few hundred feet more out and you are up to a half second delay. It doesn’t seem like much, but having the scratch track even 2/10ths of a second out of sync right out of the box negates its usefulness. Wayne I thought it might have something to do with that. So far, I've been around 50 feet max, so I've been able to use it.
What's your preferred method of syncing? I put both tracks on headphones and adjust them until there is no difference between the two. I've never been taught how to do it, necessarily; someone on YT kinda got me started by showing me the 'Clap hands, audio spike' method, but I can't exactly stop live music and go "Wait, stop! Gotta clap my hands!" 

Much more editing, and I might be able to read lips; I've done four hours of production (real time) and produced a DVD from the first two. Need to get the last two onto DVD.
The first DVD of the (Live) show seemed amazing to me at first, but the more I watched it, the more I realized how shaky it was. The Christmas show is a different story... I took a 'Zero Shake' policy. Some still made it in, due to me editing on a small screen... Any shake is more than I like, but no one but an expert or I would notice.
Yeah, you wouldn't believe what a difference the smallest fractions of time make when syncing!
And I also can't believe how much faster light travels than sound! I guess that's why some people look bright until they start talking! 