Bug#753584: Should depend on mate-media-pulse | mate-media-gstreamer

[Vlad Orlov]

That's right, you can only get the normally looking and working volume control
dialog with PulseAudio backend. With GStreamer one the volume control dialog
is practically useless - especially if GStreamer "ends up using pulse underneath".

If PulseAudio is installed in the system (and it is), you need a PulseAudio-compatible
volume control dialog - for example, to manage input/output devices effectively.