Thanks Gentlemen,
I did in fact use a sync point, in this case a iPhone Slate application.
The problem was the SR. The 7D is at 44.1 and my external audio is coming in a 48kHz. I’ll just re-sample the audio from the external source. I’ll know better next time!
Thanks for the tip about the .mp3 format. I know that I have some others to choose from.
I am going to do a drift test as well to see how long it takes the audio to get out of sync and I’ll no to watch for that next time.
I appreciate all the help.
David