Start up audacity and pavucontrol.
Within audacity click on the Record button
Start up pavucontrol and under the Recording tab
choose the Monitor device to record from (e.g.,
Monitor of Built-in Audio Digital Stereo (HDMI)).
Back in audacity stop recording and delete the sound track by clicking the small x at the left of the main window.
Now start recording again and then start the audio that is required to be recorded, such as some sound track through the browser from some website. Check that audacity is showing signal so that we have the right Monitor device chosen and that the volume control is load enough.
When finished simply stop recording, edit if required, and export to mp3.
For further details see https://www.maketecheasier.com/record-system-sound-linux/.
The package audio-recorder from
ppa:audio-recorder/ppa is simpler to use, allowing the choice
of the audio source from its audio settings drop down menu however not
as capable as audacity, as in, for example, showing the
UV meters for the recording level, etc.
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