[Gnome 3] Uses for System Sound Alsa instead of Pulse Audio?!

If I open "Sound Settings" click on the reiter "Applications" then I see which programs are currently playing sound.
Because I have installed the freedesktop sound theme I hear some sound if I raise or lower the volume.
But why does it listen that the gnome-shell uses the alsa-plugin instead of pulse audio directly?!
Best Regards

Hmm... well I'm using Gentoo, and I have alsa flag turned on in my instalation of sun-jdk. So I don't know, but as I say, playing buffered sound with SourceDataLine and hardware mixer (not Java Sound Audio Engine) causes the same artifacts at the end of the sound as mplayer using oss. Might as well not be related at all, but then maybe you (or anyone else) can tell me if you can observe the same kind of behaviour while playing sound with java on your machine? I have cheap Realtek High Definition sound card, but it doesn't change the fact that in Windows, the sound plays correctly.
But thanks for reply :)
PS. by OSS in this context I mean oss emulation in ALSA.

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[Gnome 3] Uses for System Sound Alsa instead of Pulse Audio?!

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