Audio Stuttering
Whenever any sound is played on my machine the audio stutters. This includes youtube videos, streaming from google music, playing music in itunes, and even when I change the volume (without any media playing). I am running Mac OS X 10.6.8. The problem went away for about a week (I'm not sure why), but then came back. I can't think of any software that I've installed that would have caused this and have no idea what the problem could be. Any help would be appreciated. Thanks!
Mac Pro, Mac OS X (10.6.8)