/usr/share/help/kn/gnome-help/sound-usemic.page is in gnome-user-docs-kn 3.28.1-0ubuntu1.
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<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" type="topic" style="task" id="sound-usemic" xml:lang="kn">
<info>
<link type="guide" xref="media#sound"/>
<revision pkgversion="3.7.1" version="0.2" date="2012-11-16" status="outdated"/>
<revision pkgversion="3.10" date="2013-11-01" status="review"/>
<revision pkgversion="3.13.92" date="2014-09-22" status="candidate"/>
<revision pkgversion="3.18" date="2015-09-30" status="final"/>
<credit type="author">
<name>Shaun McCance</name>
<email>shaunm@gnome.org</email>
</credit>
<credit type="editor">
<name>Michael Hill</name>
<email>mdhillca@gmail.com</email>
</credit>
<credit type="editor">
<name>Ekaterina Gerasimova</name>
<email>kittykat3756@gmail.com</email>
</credit>
<include xmlns="http://www.w3.org/2001/XInclude" href="legal.xml"/>
<desc>Use an analog or USB microphone and select a default input
device.</desc>
</info>
<title>Use a different microphone</title>
<p>You can use an external microphone for chatting with friends, speaking
with colleagues at work, making voice recordings, or using other multimedia
applications. Even if your computer has a built-in microphone or a webcam
with a microphone, a separate microphone usually provides better audio
quality.</p>
<p>If your microphone has a circular plug, just plug it into the appropriate
audio socket on your computer. Most computers have two sockets: one for
microphones and one for speakers. This socket is usually light red in color
or is accompanied by a picture of a microphone. Microphones plugged
into the appropriate socket are usually used by default. If not, see the
instructions below for selecting a default input device.</p>
<p>If you have a USB microphone, plug it into any USB port on your
computer. USB microphones act as separate audio devices, and you may
have to specify which microphone to use by default.</p>
<steps>
<title>Select a default audio input device</title>
<item>
<p>Open the <gui xref="shell-introduction#activities">Activities</gui> overview and
start typing <gui>Sound</gui>.</p>
</item>
<item>
<p>Click on <gui>Sound</gui> to open the panel.</p>
</item>
<item>
<p>In the <gui>Input</gui> tab, select the device that you want to use.
The input level indicator should respond when you speak.</p>
</item>
</steps>
<p>You can adjust the volume and switch the microphone off from this
panel.</p>
</page>
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