My mac book pro seems to be distorting (crackling) songs through itunes / any program or site when adjusting volume. (only happens adjusting using keyboard short cut)

What i've got:
Mac book pro: 10.6.8 OS X
What's happening:
A couple of weeks ago, I was adjusting the volume of an i-tunes song using the apple wireless keyboard. When i adjust it, either up or down, crackling and skipping of the song occurs. Happens to ALL songs on itunes, only happens if I am using my keyboard or mac book controls to change the volume. (does not occur when I adjust using i-tunes volume control). I wanted to see if it was i-tunes or not, but it seems even when adjusting volume of a website song or anything crackling and distortion still occurs!
This is complete bull poop.
Let me know if anyone has any ideas, because I am STUMPED.

Since your issue occurs when using iTunes, post in their forum area.

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