Linux Drivers?

So I recently upgraded to 8.04 Ubuntu and since then my sound drivers have stopped working entirely. I have been looking around the web for probably 2 hours and I have come up empty handed. The sound card I'm using is Turtle Beache Riviera. If anyone knows where I could find the appropriate drivers please let me know.

All I could find was this
http://www.soundcard-drivers.com/drivers/211/211211.htm
It requires you to register before downloading.

[rant]
The manufacturer's site was playing pranks with me. They gave me a download link back to the support page. Bloody idiots, they could simply say -- "no we don't support Linux".
http://support.turtlebeach.com/site/kb_ftp/587516740.asp
[/rant]