Output Sound Problem

Has anyone noticed that output sound on the itunes is distorted and after opening and playing the same file in QuickTime that the problem is gone?
I am using iTunes to open and play a sound file, say an imported CD song, and the sound is distorted.
Checking the preferences option to perform a Sound Check helps but does not completely solve the problem. After opening Quicktime and opening the same file, the output sound is fine, in both applications?
It seems that all was well before my update of the applications and the Firmware. Should I be suspicious of that as the culprit or is this some other symtom of impending doom?
The sound problem is on internal speakers, earbuds, or a set of sennheiser headphones.
itunes 7.0 updated a few days ago
QuickTime 7.1.3 updated recently
SMC Firmware update a few days ago
White MacBook 2Gz   Mac OS X (10.4.7)   First Mac

I might have the same problem. Playing audio occasionally becomes very scratchy, to the point that I have to stop listening. It usually lasts a few minutes. It's maddening.
It happens via the internal speakers or through headphones.
Occurrence isn't very consistent. I notice it most in iTunes (v7), but that's probably only because I play most audio in iTunes. I've had it happen now when playing video in VLC, too. It seems to only happen after playing audio continuously for at least 10 minutes. I haven't been able to reproduce it at will, so I haven't bothered taking it to my local Genius bar yet (at least not for this problem).
MacBook   Mac OS X (10.4.8)  

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    Attachments:
    LabVIEWSynth.vi ‏94 KB

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