[CentOS] domU: no audio device

i created a centos 5.3 hvm domU.

i have tried any one of the following in the xen config without luck
soundhw = "all" or "sb16" or "es1370"

dom0:
#virsh version
Compiled against library: libvir 0.7.0
Using library: libvir 0.7.0
Using API: Xen 3.0.1
Running hypervisor: Xen 3.1.0

# uname -a
Linux localhost.localdomain 2.6.18-128.4.1.el5xen

# /usr/lib/xen/bin/qemu-dm -soundhw ?
Valid sound card names (comma separated):

-soundhw all will enable all of the above

pls advise.




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