Karsten Merker provides the following analysis of this bug: Xfce4-mixer did not work out of the box. On start, it complained that "GStreamer was unable to detect any sound devices". The reason for this was that the gstreamer0.10-alsa package was not installed. This problem has already been submitted by somebody else in bug #651495 last year; the problem has been confirmed by another submitter in June 2012 and is still open. This should be fixed before the wheezy release, in particular as xfce is now the default desktop for wheezy. From a first look at the issue it seems that there is no explicit dependency on gstreamer0.10-alsa in task-xfce-desktop. Xfce4-mixer itself depends on "gstreamer0.10-alsa | gstreamer0.10-audiosink", whereby gstreamer0.10-audiosink is a purely virtual package provided by other gstreamer-plugins, so if some other application pulls in e.g. gstreamer0.10-plugins-good, the dependency gets fulfilled but the mixer nonetheless does not work on an alsa device.
I will be working around this in task-xfce-desktop, I suppose, but am leaving this bug open where it is, since the same situation can be obtained without using tasksel. -- see shy jo
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