Audio with QEMU

Well, I've got my QEMU terminal booting and mounting the filesystem 
over the network. Now I'd like to get audio working, so I start QEMU
with the -soundhw sb16 option and put the following in plan9.ini:

audio0=type=sb16 irq=5 port=0x220 dma=5

When I reboot and 'bind -a '#A' /dev', I can now use madplay to play
an mp3, but the output I get is very scratchy and generally ugly, like
a terribly static-garbled radio station. Can anyone with experience in
this give me some pointers? Thanks.

John Floren