stupid onboard sound

here's a good one...
i'm running mandrake 9.2 / gnome. i have 2 sound cards: an onboard C-Media card (which i don't want to use), and a pci Creative SoundBlaster Audigy card (which i do want to use).

i'm not getting any sound out of the audigy... how do i disable the C-Media card and/or enable the audigy so it works?!?!

oh man...

thanks in advance...

~zach