I Have Insomnia (book-learnin’ inside)

I haven’t been able to sleep for the last two days, so I decided to make myself useful and write up an in-depth breakdown of the automatic pop filter circuit I posted the link to previously. It’s a little bit hazy on some details (it’s been awhile since I dissected a complex active circuit and a lot of the math seems to be gone), but I think I’ve got most of the essentials there. Tried to avoid lapsing into jargon when possible, so not too much electronics knowledge is required. Questions, comments, and snarky posts pointing out any blatant factual errors it may contain are welcome.