====== Sound - Change the volume ======

Control the volume using the alsa utils.

The volume of sound cards can be controlled with amixer.

<code bash>
amixer set -c 0 Master 25 unmute
amixer set -c 0 PCM 25 unmute
</code>

See also http://slopjong.de/2011/08/20/unmute-the-sound-card-using-the-alsa-utils/