/usr/share/cairo-dock/gauges/Sound-Mono/theme.xml is in cairo-dock-plug-ins-data 3.3.99.beta1.2.really.3.3.2-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | <gauge>
<name>Sound: Ubuntu Mono Dark</name>
<version>3</version>
<author>Ubuntu-Mono Designers</author>
<indicator type="images">
<file>0.svg</file>
<file>1.svg</file>
<file>2.svg</file>
<file>3.svg</file>
<file type="undef-value">undef.svg</file>
</indicator>
</gauge>
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