Hello,
I've been having this problem for a few good months: the sound coming out of Firefox when playing e.g. Youtube videos or MIDI files is choppy, as if only every other sample of the sound were played. This happens even when there aren't many programs opened, so likely not a performance issue.
The problem is not browser-related, as the same thing happens in Chrome and IE. I'm guessing it's from Adobe Flash Player, even though I also get choppy sound when playing sound files which I don't think play through Flash, such as this one.
Playing other sounds, e.g. MP3s using Winamp, works just fine.
I'm running Win XP 32bit on a laptop with 4GB RAM and dual core CPU. I tried to find the Flash version but I'm not sure where to look for it.
Can anyone help? Many thanks!