Syncing audio recorded on other devices

[LarryF]

Hi folks,
What I am proposing to do is this: I have been asked to do the video for a friend's wedding. I would like to use a seperate audio recorder to record the audio of the wedding while I do the video on my camcorder. Then import the seperate audio track into VS X4 and sync it up with the video. The reason I am going to this extra trouble is that the built-in microphones on my camcorder are not that great unless I am "up close and personal" with the subject of the video. I have tried a short clip using an old MP3 player that records mono sound files and it appears to work well for the short video clip. Has anyone tried this with a longer clip, say up to an hour? If so, were ther any problems keeping the video and audio tracks in sync? Are there any tricks you might suggest for me?
It appears to be simple on the surface, but I am concerned that I'm overlooking something that will come back and bite me later. Any suggestions would be welcomed. Thanks in advance for your input.

Larry

[skier-hughes]

Find a recorder that will record a wav/wma audio file (or just about any decent file) rather than mp3.
Use a clapperboard or something similar to give you a very short sweet sync point.
Don't turn either off until you have finished.
If you do record a mono signal, remember to duplicate it to left/right channels.

[LarryF]

Thanks Graham,
The idea of the clapper is a good one. I'll try that the next time I do a test.