Final Cut 7 audio sync issue with external audio

Ok, I've seached around a lot and still haven't found the solution for this common issue, which is sync between video and audio wich were recorded in two different devices.
My video is from a conference (a lady speaking all the time) ProRess 29.97 and my audio is wav recorded at 44.1 Khz. I have already converted my external audio to a fine AIFF 48 Khz, and I have already re-imported it with the correct 29.97 easy setup, as it shows on this video www.youtube.com/watch?v=Nt-nfelM8KA. That helped a lot but audio still goes out on sync when playback goes further (not that much, but it shows).
On Premiere Pro, that wav file a correctly in sync, and I have had this issue before with FCP and now it has come back! help!
Anyone found a real solution for this issue?

Why not just use Premier? FCP is going to slowly die out anyways....
Anyhow, a work around... using the speed change tool (sss) adjust the audio to be the same length of the video so it is in sync... Press command-J, make note of the percentage you sped up your audio. Now open your audio in STP, select all of your audio go to Process>Timestretch and adjust the audio and apply the same percentage.
Listen to your audio. STP's time stretch is excellent because it adjusts the speed without changing the pitch.
Save as, re-import your audio.

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