go to http://opensource.creative.com
download the source and unpack it into /usr/src
cd into the directory you just unpacked
type less README
follow intructions there build the driver and all the tools
after that is all done type modprobe emu10k1
if you are using X, it is a good idea to restart it (mostly for kde).
you should have sound.
you can use the audigy-script to fine tune your card settings, it is included with the driver.
good luck, have fun.