Comment 16 for bug 1016969

Annnnd, thanks to the googlespheres: the answer. (At least it solved my problem in Fedora.)
https://launchpad.net/debian/experimental/+source/pulseaudio/2.1-1

<quote>
* debian/patches/remove-analog-mono.patch:
    - Added. Remove analog-output-lfe-on-mono mixer path, although in principle
      Ac '97 hardware has a seperate mono LFE pin nothing seems to use it. To
      make matters worse it does confused pulseaudios port selection slightly
      which causes audio in virtualbox not to work out of the box
      (Closes: #673847)
</quote>