Comment 4 for bug 483812

It looks like a regression. Pulseaudio has been default since Hardy (8.04). IIRC, I'm pretty sure that this worked for me in Hardy and Jaunty (9.04). People are reporting that it does not work in Karmic (9.10) and later. I can confirm that it does not work in Natty (11.04), the latest release.

If this is all correct, then since Pulseaudio was made default in Hardy, this functionality worked for 3 releases then stopped working for 4 releases and still counting. I hope this is fixed by the next release.