Accumulate instructions for inclusion in app for how to record output monitors

[Ben Wiley]

For Linux users with PulseAudio we can just say to run this:

pactl \
  load-module module-remap-source \
  master="$(pactl list | grep -A2 '^Source #' |  grep 'Name: .*\.monitor$' | awk '{print $NF}' | tail -n1)" \
  source_name=systemout_monitor \
  source_properties=device.description=System_Audio_Output

For Mac we can consider Black Hole, or hopefully BackgroundMusic, which seems simpler to manage: https://github.com/kyleneideck/BackgroundMusic#recording-system-audio

For Windows we can adapt this tutorial: https://www.howtogeek.com/howto/39532/how-to-enable-stereo-mix-in-windows-7-to-record-audio/

[Ben Wiley]

For Background Music we should recommend installing version 0.4.0 https://github.com/kyleneideck/BackgroundMusic/releases/tag/0.4.0-SNAPSHOT-b38f6dd

[Ben Wiley]

For Android we can recommend using this app to record a file and then importing it: https://play.google.com/store/apps/details?id=io.sbaud.stereomix

We'll need to note the caveat that some apps prevent any other app recording their audio output, including Spotify and Chrome. Other apps, like VLC, do work.

[Ben Wiley]

For iOS we can include instructions for doing this with garage band

[Ben Wiley]

This is good for Windows: https://allthings.how/how-to-enable-missing-stereo-mix-option-in-windows-10/