44.1khz to 48khz

Save your original recording as an AIFF file at 44.1kHz. (It may already do this, of course.)

Open in Quicktime Pro, File:Export:Sound to AIFF:Options - set Rate to 48kHz.

Use THAT file to import into FCP.

you can also just use iTunes to make the change by setting the import preference to 48kHz. No more money to Apple.

Dual G5/2.5GHz/4.5 GB, internal ATA, G-SATA 500 Mac OS X (10.4.7) Final Cut Studio 5.0.4

"...Ah, good old Quicktime pro... more money to Apple :-D..."

Does FCP Studio no longer come with a Quicktime Pro Key? It used to. If so - no more money to Apple.

Sorry...did not understand that you meant out-of-synch tempo-wise or speed-wise. So you recorded your audio on a separate device, (say, a DAT recorder) and intended to synch it with your video? I can not see how audio sample rate (and/or converstions between 44 and 48 kHz) would ever effect speed. I am wondering about the devices you used to record you audio and video, and if you used the same ones to capture to digital. Or, perhaps the power supply to the units was not consistent (between recording and capture) and created a slight speed shift in a tape transport mechanism. Obviously, I have no clear idea sorry. Hope somebody has a definitive answer for you.

Sample rate doesn't affect duration.

Is it possible that your audio and video were recorded at different FRAME rates?

The installation of FC Studio vers 5 automatically registers QT as a QT Pro version.

No offense, but maybe the "small digital recording device that plugs into a lapel mic" is of not too high a quality, and it's not actually recording at EXACTLY 44.1kHz, despite the spec., - just something CLOSE to 44.1.

(Quartz controlled frequencies are good at staying constant, but an economy in the manufacture of such devices might have had quite a wide selection tolerance on quartz crystal frequencies AROUND, but not EXACTLY at 44.1?)

And hence that's why sync drifts off?

Sample rate doesn't affect duration.

it's true sample rate shouldn't affect duration (time).

Learn What Sample Rate is HERE

Just because there were 44,100 samples per second rather than 48,000 samples per second does not make a second more or less than a second.

Your two devices were not "crystal locked" as we say - i.e. they were operating independently, and both are recording at slightly different speeds. Without using a third device as a synchroniser, it is impossible to have two devices run at exactly the same speed over any length of time. Hence, pro gear is always synced to avoid exactly this problem. Sorry, you're SOL.

You might consider doing your speed changes to the audio in a specific audio application like Soundtrack Pro or Peak, both of which will do the resampling at a higher quality than FCP.