I've been testing it for a while without the pci riser card since it was on backorder. I guess there's no way to know if its the video card + sound card combo and NOT the riser, since well, you can't have those in there together without it ;P
** EDIT **
BTW its an EIPA M1000 Nehemia core mainboard. I just upgraded to the latest flash (annoying flashport said the new bios wasn't compatible, so I had to hook up a friggin floppy drive and guess what, flashed like a champ ;P) still same problem. Its so bad that even as I type the music distorts ;(.
Whats strange is that on the dual pci riser card there is a big jumper block, with no instructions or markings as to what the jumpers mean

?
** EDIT **
This is weird, all noise and interference just went away..........
-Jason