I agree with poorboy. It's most likely an application-by-application change you need. To test this start up xmms and look in the options. You should be able to select the sound driver in there (I'm not at my linux machine this week so I can't tell you exactly where). If you select the emu10k1 driver and it works, then you know this is what you have to do for all your apps. I know this is what I had to do with my nforce2 (CRAPPY linux support) and my SB Live! 5.1.
Some day I'll be rich and famous for inventing a device that allows you to stab people in the face over the internet.