virt-manager with KVM does not have sound with all guests

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http://forums.fedoraforum.org – I tried virt-manager 0.8.0-7 or 0.8.1-1, my guest like fedora 12 i386, ubuntu i686, win xp do not have any sound even they detect the driver(es1370 or ac97) correctly. I doubt it is because of the pulseaudio and the qemu's user. Qemu uses not my user, it uses qemu user. If I uses qemu-kvm directly, it has sound and work fine. (HowTos)