I have the same audio card and alsaconf detected it no problem...
maybe it is the kernel, did you build it??
maybe it the version of alsa, that's old and doesn't support that card... check http://www.alsa-project.org/alsa-doc/
also go to your /usr/src directory, cd to linux directory (supposing it is your kernel source directory) and as root execute 'make menuconfig' and in the section "device drivers" seek for this card... see if it was included in your kernel