audio recording - millette/tournemain GitHub Wiki
- https://wiki.archlinux.org/index.php/PulseAudio/Examples#ALSA_monitor_source
- https://superuser.com/questions/874834/how-to-record-audio-from-only-a-specific-program-on-linux
- https://sites.google.com/site/installationubuntu/audio-and-video-in-ubuntu/record-internal-audio
- https://www.pantz.org/software/alsa/recording_sound_from_your_web_browser_using_linux.html
- https://askubuntu.com/questions/250073/how-to-record-any-internal-sound-in-and-out-using-ubuntu-and-audacity