Distortion/fuzz through itunes

Using a macbook pro, and this has been going on through several versions of itunes, nothing to do with CPU or speakers or power source etc. When playing music through itunes, songs will start to distort/crackle (more for some songs than others.) At first i thought it was my speakers and i sent them back, then thought it was my mixer and spoke to the support team, BUT realized shortly afterwards (with having no luck) that it's nothing to do with the mixer because you can play the same files through quicktime and they wont crackle!
Any Help???? Solutions????

I'm going to show you a test to determine if the files are corrupt.
Take one of the songs (one that crackles a lot would be best, just so you can see a better contrast) and remove it from your iTunes library. Don't delete the file. Move the file to your desktop. Add it back to iTunes. Try playing it. If it still crackles, then it's probably that the files are corrupt. If not, then it had something to do with the way iTunes was reading the file or something. If it didn't crackle, remove it from iTunes. Then you can move the file back into where it was originally. Add it back to iTunes. Now, remove all your songs from iTunes and, without moving the files, add them back to iTunes.
Before you do this, you might want to make sure that all your songs are in the same place so you don't miss any. You can do this by opening iTunes, and going to File-> Library-> Consolidate Library.
If the previous test didn't help, normally, I would say that you should restore from a backup of the files because they might be corrupted. But you say that you can play them O.K. through Qucktime. If that's the case, than it seems like it must be something with iTunes. I don't know anytying off the top of my head that might help, other than what I already told you.
You might end up just calling Apple tech support.
Sorry I can't be of more help.
Nate

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Distortion/fuzz through itunes

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