How do you change the speed of a detached audio clip?

I have a piece of detached audio.  Video Frame rate is 23.98.  The piece of Video above it is Video Frame Rate 24.
How do I change the speed of this detached audio clip?

Nope, the Automatic Speed did not work.  I exported the XML, and then ran it through X2Pro to try and get my AAF, and it still spits out conform warnings/errors on those same spots.  Automatic Speed apparently did nothing helpful to my situation.  (Can Anyone explain Automatic Speed?)
Will have to try going through Cinema Tools per the similar issues noted in this conversation: http://forums.creativecow.net/thread/344/28007
Curious to see what FCPX would do with this media, importing the 24p file to a 25 Project cause a noticeable shift in both time and pitch.
I imported the time coded audio separately, and played it against the obviously speed and pitched changed video with embedded audio. The files did not sync.
The audio remained in time and pitch, while the video didn't. So the audio tc doesn't seem to effect playback in FCPX, but video definitely does, and it seems rather buggy.
So, if your video is 24.0 and your audio is 23.98 and you are in a 23.98 timeline, FCPX might be changing the speed of the video without really reporting it. Resetting speed doesn't do anything, hitting "automatic speed" screws it up a bit more (it goes the wrong way). Changing the speed to something like 96% (FCPX reports 96% but I know it's really ((24000/1001)/25) which is just short of 96%. Turning off the "preserve pitch" checkbox actually pitched the audio back to normal.
I didn't create the 24.0 vs 23.9 media that you have, but perhaps you are having similar issues, or a different combination/permutation therein.
But to answer your question, the time coded audio was not changed, only embedded audio.
and
But here some notes which makes things hopefully clearer.
Resampling and changing playback speed are two totally different things.
Samplerate for audio is the same as fps for video (not dpi for video) so let's call it sps.
You can record audio at any sampling rate. But let's take 48 kHz and 32 kHz here.
Record 60 seconds. Once recorded both files as stand alone files will play 60 seconds.
But forced to play back in a NLE timeline with a fixed sps of 48 the first file will playback correctly. The second one will play at 2/3 of the time (32/48). The other way round the 48 sps file will play longer in a 32 sps timeline.
Now for those poor guys who have to work with NTSC:
A real world second is not a second in NTSC video world. Its 1001/1000 seconds.
So selecting a 48k sps audio preset in a timeline preset means that a real world audio of 60 seconds is only 1000/1001x60. That means that those 60 seconds are only 59.94 seconds long. Its too short.
One way - if you stay strictly in NTSC - is to record audio with 48048 Hz. This way a real world 1 second audio will match a 1 second NTSC video.
Next option with BWAVE files is to change the playback settings in the BEXT header of the file. This won't resample the file!!!
Now about the TC. BWAVE doesn't have a TC in a way you're used when handling video. It has a timestamp in the header. This timestamp contains the Samples after Midnight. Based on that the NLE will convert this to TC which can be displayed. So in NTSC world this might give a wrong interpretation.
For example if you have a "Start TC" of 00:10:00:00 (thats what you see on your audio recorder) it means that using 48kHz the timestamp is at 600x48,000 = 28,800,000 samples. Since the real sampling rate in the timeline though is 48048 Hz you have to divide the source stamp by this number. This results in 9.99000999000999 minutes. So for a 23.976 fps project this is a TC of 00:09:59:10.
So setting the Bext header and/or iXML chunk to the correct playback speed will keep everything intact. Again this is without resampling!
Using an AIFF there aren't these options.
So you can edit all the stuff without resampling when using BWAVE. But resampling will happen when you export a final movie.

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