you have to compile the kernel with sound as module if you have a 2.4.x kernel you then use alsa-driver a good faq on how to
http://www.gentoo.org/doc/en/alsa-guide.xml its meant for gentoo but you can use it for any other distribution as well just have to change some things
if you use the 2.6.x kernel you have to compile it again with sound as module and the chipset driver of your soundblaster should be a en... or something like this have a look at your soundblaster manual which chip it uses.