Audio Synch Drift After Export

I'll try again, since no one answered the last time I asked. No problem with synching video/audio in FCP. However when I export either via compressor or QT movie I get audio drift that worsens as the film continues.
Video is in SD.
I would appreciate any helpful response. Thanks!

The audio is a remix done by a sound engineer to replace the original audio which had some serious problems.
The audio rate of the original and the remix is 48 Khz. The original was 16 bit, the mix is 24 bit. I'm a little new to this, so I'm not sure what you mean by sequence settings. Thanks.

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