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

===== Using mp3gain =====

<code bash>
find / -iname '*.mp3' -exec /home/peter/Downloads/mp3gain/mp3gain -r -c -m 4 {} \;
</code>

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===== Using Alsa =====

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>

<WRAP info>
**NOTE:**  See also http://slopjong.de/2011/08/20/unmute-the-sound-card-using-the-alsa-utils/
</WRAP>



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===== Using alsamixer =====

<code bash>
alsamixer
</code>

Save the settings.

<code bash>
sudo alsactl store
</code>

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===== Using amixer and pactl =====


==== Increase volume ====

<code bash>
amixer set Master playback 5dB+
pactl set-sink-volume @DEFAULT_SINK@ +5%
</code>

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==== Reduce volume ====

<code bash>
amixer set Master playback 5dB-
pactl set-sink-volume @DEFAULT_SINK@ -5%
</code>

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==== Toggle mute/unmute volume ====

<code bash>
amixer -D pulse set Master toggle
</code>

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