How do I fix audio drift?

I have two audio clips – one clip has slight drift. Is it possible to sync the two clips perfectly in either Soundtrack Pro or FCP? How? Thanks.

If you double click a file and open it up in the Audio Editor, select the whole file and then under the +Process Menu+ select *Time Stretch* you can change the duration in any unit from Seconds to Frames to Samples . . . so you have nearly infinite resolution.
The problem is how much to change it. It looks like your problem is between two sources running on two different clocks (probably both internal). You're probably going to be stuck with trial and error. Worse than that is that with inexpensive clocking devices they could actually be changing over the course of the recording, or day.
Unless both recordings start and stop at exactly the same time - unlikely. In that case you could measure the length of the two recordings in the inspector window and apply Time Stretch to one to make it the same length as the other.
Solutions would be to sync the two recording devices to a single clock source. or the old fashioned method of having a 2pop or clapper at the beginning and end of recordings.

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