Crackling audio after appying letterbox effect

After letterboxing my clips, audio has crackles in it (irregular small clicks, roughly 3 per second). Other than this problem, the audio is of normal volume and quality.
I've verified that the original clips did not have this problem.
This is my first experience with iMovie. This wouldn't be nearly as frustrating if effects rendering on a 1.5 hour movie weren't an overnight job, but well... it is.
Any ideas?
Thanks
iBook G4 Mac OS X (10.4.5) iMovie 5.0.2 (111)

Lame, my first foray into Mac (in years), and I find a bug right off the bat.
Anyway, I've still got the original clips, so no need to re-import. I'll try the audio extraction.
Thanks for the tip.

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Got crackling audio in MainStage 2.2.2? I did, and here's how I fixed it...

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A lot of people are talking about an issue in MainStage 2.2.2. where crackling audio gradually builds in the signal and eventually becomes unbearable. I had this issue but none of the solutions I found in the support community worked for me.
The obvious fix is the increase the sample buffer size until the issue goes away (as it's often a matter of the CPU not being able to handle the load, especially on older machines). You can also turn on the Safety Buffer checkbox, which can further reduce the problem. My issue wasn't solved this way, unfortunately; no matter how high I increased the sample buffer, the problem persisted.
It seems the problem was being caused by my USB interface, which is a very good unit (the Focusrite Scarlett 18i6). My first mistake was that I used the Scarlett for input, but used built-in output. I suspect the Mac (2012 non-Retina MPB, 2.3GHz i7, 16 GB RAM, SSD) had trouble synchronizing with the device. I routed the output to the Scarlett as well and that seemed to fix the crackling. I had a problem with the device putting the dry signal Mainstage, which wasn't good. I then downloaded the software mixer (found on the Focusrite site) and, when I tried to run it, it told me the Scarlett needed a firmware update. So that was applied. I then ran the mixer and chose "DAW1" routing preset. After that... no more problems at all.
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Good luck!

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You said ...
Another question for the audio guys. Would adjusting the "Loudness" setting on the original clips to increase their levels lose me quality over replacing them with the audio files from the recorder?
(Our setup on set, btw was a Fostex recorder and boom mic recording to CF cards, and audio was feeding out of that into our F900 camera (so all of the clips have sync sound as well. The audio that hit the camera though, is significantly quieter than the individual sound wav files off of the Fostex)
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TS3789 I have similar problem, my apple tv which has always worked properly with my Samsung tv will no longer play any audio after the latest 5.1 upgrade. Very frustrating as it was working perfectly before. I am starting to not trust apple upgrades until

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Crackling audio after appying letterbox effect

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