if that's not it, I'd be inclined to blame QuickTime and suggest a more purpose-built audio recorder application like audio hijack for your existing recording, FCPX has a speed adjustment option, so you can speed up your audio by a factor of about 1.001 (±.0005 or so) there
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this assumes the drift occurs at a constant rate, anyway if you run into issues in FCP, you can always put it through ffmpeg, like so: ffmpeg -i input.m4a -af atempo=1.001 output.wav
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Replying to @Dogen
was it too precise for FCP's clip retiming to adjust, or did the drift turn out to be nonlinear?
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Replying to @11rcombs
I tried converting the original audio file to a slower speed using compressor as an alternative, but even the difference between 99.97% and 99.98% was too great, unfortunately. Spent most of today trying physical tricks. About to test audio hijack!
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Replying to @Dogen
the ffmpeg command I mentioned will let you adjust the speed by arbitrarily precise factors
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Will definitely give it a try after this test!
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