Debian Hardware :: ALSA - Noticed Some Sort Of Crackling In Audio

I am having a really annoying problem here. Every time when I use my Computer while listening to music, or watching a video, I get some sort of crackling in my Audio. For example, playing a mp3 with Rhythmbox (or Banshee or Totem, doesn't matter really) while browsing the web is just horrible, every time I scroll down the page (Mouse wheel or keyboard) I get that noise. Just listening to the music while not touching the Computer works just fine. It does not seem to be CPU related, my reason being: I can max out my CPU, rendering a 3D graphic and still have crystal clear sound, but browsing down some big file-folder at the same time will distort my audio.

The same goes with games which are a bit on the high CPU side, like Nexuiz with high graphic settings: No sound problems at all. I am using my on-board sound, which lspci lists as VIA Technologies, Inc. VT1708/A [Azalia HDAC] (VIA High Definition Audio Controller) (rev 10), pure ALSA setup, no pulse/esd or anything of the like installed. Switched to unstable to see if a more up2date kernel or updated alsa would do the trick, it didn't! I am running Debian Unstable - 2.6.37-2-amd64 kernel, Gnome-Desktop. Here's what I did to make my sound work in the first place, since my squeeze didn't recognize my sound-setup out of the box:

To make my onboard sound system-wide default I created /etc/asound.conf:
# Modified as per [URL]
pcm.!default {
type hw
card VT82xx }
ctl.!default {
type hw
card VT82xx } .....