Why is sound distorted on my MacBook?

Okay so a few days ago I noticed a fuzzy, distorted sound quality during video play. This is the case when I use youtube, watch other flash videos, or play songs in itunes. The normal sounds for the system commands such as turning it on and off or that scary sound when I try to do something that my computer won't let me do are fine. I'm trying to avoid having to take it to the "genius" bar and lose valuable time. Any suggestions? I recently updated to snow leopard. Please help!

Try resetting the SMC.
Barry

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