Thanks Anton, it seems like this problem comes and goes. 
Can you try the following:
* remove yourself from the audio group
* note whether sound is now broken or still functioning
* reboot
* note whether sound is now broken or still functioning
* while you're sure sound is broken, run:
getfacl /dev/snd/c*

Thanks!

-- 
Sound permissions broken after an update of Lucid on 12-20 aug 2010
https://bugs.launchpad.net/bugs/622664
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