[CentOS] Multiple sound cards

Afternoon,

   I recently upgraded a machine to CentOS 4.0 and it
has two sound cards: built-in VIA, Cmedia PCI card.
The OS recognizes both and I can use the tool,
system-config-soundcard to test them. However, I
can't seem to get any sound out of the VIA card, but
the Cmedia plays the test sound just fine. The problem
is that I can't get any sound apps to use the Cmedia
card, particularly xmms. Any hints or helpful comments?

TIA!

Jeff