Two identical audio tracks, identical waveforms, BUT non-sync playback!

Hi all - I've been up all night trying to figure this one out... I've shot a video on XDCAM, edited using the native codec in FCP 6.06, graded in Color and sent back to FCP as ProRes 422 (HQ).
Now, here's the weird one - the original unmixed soundtracks have remained in sync with the graded video, but the mixed track from the sound studio gradually drifts out of sync by about 15 frames after 10 minutes of playback. I figured it was just a sample-rate mismatch but all tracks checked out and are all 48KHz - even the graphical waveforms are visually a frame-perfect match. Then I figured it could be hard disc speed or an issue with the Blackmagic card - but an export to DVD via Compressor also produced a disc where the audio gradually slipped out of sync so I've pretty much ruled out hardware.
The only difference I can see in FCP is the sequences are '32-bit floating point' and the 48KHz .wav mixes are '16-bit integer'... I've tried changing the sequence settings but the audio still drifts.
Any guidance would be much appreciated... this thing isn't giving me any more clues to work with!
Cheers,
Tom

Thank you for your solution! I just ran into a similar problem. A friend of mine cleaned up some audio for me in his studio, and he gave me 96KHz WAV files. I put the WAV clips into the timeline, and lined up the visible waveform, exactly to the frame (I found a very distinctive click on one frame near the end of the clip). But the WAV audio gradually drifts, so at the end of about one hour of video, the WAV audio sounds about 60 frames late! I can see that distinctive click in the waveform, but I hear that click 60 frames later! Even when I delete the video and the original audio, so only the WAV file is playing, the sound of the audio drifts out of sync with the visible waveforms. Very strange...
I will try your solution of running the WAV through Compressor to produce an AIFF, and I'll let you know what happens. - Seth Hill

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Sent from my BlackBerry 10 smartphone on the Rogers network.

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