here's a link to the emu10k1 site
http://opensource.creative.com
you should be able to adjust your sound settings by going to (in kde) kicker->Sound and Video->Sound Mixer or in Gnome Bluecurve Hat->Sound and Video ->Volume Control
Sorry, but I don't know where the configs are for the surround sound setup, but you should be able to locate them somewhere in either an FAQ or the bug-forum at the link above.