CentOS - Sep 2006 - Ownership of /dev/snd/*

I have several users using a machine running CentOS 4.4.  For some reason, the
ownership of /dev/snd/* seem to get left with a user when he has logged out (me
at the moment) which means that no one else can use sound.  Can anyone suggest
why this might be happening, or give some pointers?


Thanks

Joe