Here's what looks like the most current PCI Latency tool ay guru3d:
http://downloads.guru3d.com/download.php?det=951
It's pretty self explanatory. I also dropped my sound card latency from 32 to 16 as a slight bit a crackle returned at 32.
Last I checked, I was crackle free at 16.
Anything beats the static!
Let us know if it works for you...