CS4 audio sync problems

Hi all,
sorry if this question is old hat - I've searched the forums and can't seem to get a clear answer (most refer to CS3 and before) so thought I'd ask anew.
My preview in Premiere CS4 is fine, as is the preview in Encore CS4. The video was captured from four tapes (HD as mpeg and SD as Matrox AVI) in Premiere. The final DVD (10 minutes) consists of 21 clips. All but one are OK - this one has the voices well out of sync with the video, even though other clips taken from the same tape are fine.
I also had a major problem recently with an MP4 from youtube, which I guess is the same issue - everything else was fine, but this one clip was well out.
I'm guessing by now this is an old problem. What's the solution, please?
Thanks
Paul.

Newbie to Adobe here ...
Okay,  so after spending over 14 hours trying to fix the audio sync problem I fixed mine. After editing my project I selected Sequence > Sequence Settings > Playback Settings > under Realtime Playback make sure the "Desktop Video Display During Playback" box is selected. Next, in "External Device" change the setting from "None" to your next option. Mine reads DV: 29.97 720 X 480i. Next, Under "Export" section in that same window select the in "External Device" select the DV option again. Also, you might want to "Disable video output when in background" ...select that box at the bottom of the screen.
Now, try recording the video to the tape ....my audio now sync's as normal. I hope it works for you.\
One more thing ... you can keep the "Desktop Audio" button selected.

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