Karmic: PulseAudio Volume Control: Unmute loudspeaker symbol

[Detlef Lechner]

Hello,

[Karmic] Applications > Sound & Video > PulseAudio Volume Control >
(Volume Control [window]) shows the »Internal Audio Analog Stereo«
loudspeaker symbol as muted.
How can I unmute it?
 Synaptic: "PulseAudio Volume Control (pavucontrol) is a simple GTK+
based volume control tool (mixer) for the PulseAudio sound server. In
contrast to classic mixer tools this one allows you to control both the
volume of hardware devices and of each playback stream separately. It
also allows you to redirect a playback stream to another output device
without interrupting playback."

Kind regards,
Detlef Lechner