on a Mac, you can record your screen + mic audio by following these two sets of instructions:
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install the Soundflower Kernel Extension https://github.com/mattingalls/Soundflower/releases
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follow the steps from the "The Holy Grail (Adding Audio from your Microphone and your Computer while being able to hear the audio as it records)" section here: https://publish.illinois.edu/ahovious/help-stuff/screen-recording-with-audio-on-mac-osx/
namely: