OSS apps broken after woody->sarge upgrade

[David Pye <dmp@davidmpye.dyndns.org>]

Hi there,

I've got a brand new G4 12" powerbook, and after building a kernel including 
support for sound, everything worked.

However, after an upgrade to sarge, I now get the following errors when using 
either mpg321 or ogg123:
#ogg123 TerribleSong.ogg
Audio Device:   OSS audio driver output

Playing: TerribleSong.ogg
Artist: ***
Title: ***
Transcoded: mp3;112
libao - OSS cannot set channels to 2
Error: Cannot open device oss.

This happened straight after the dist-upgrade, and a reboot etc hasn't 
improved it. Is it a known issue and if so, is there any workaround?

Thanks a lot,

David