I have been watching on Prime some of those Classic Album shows. They run through an older album with the artists and talk about how it was made. Often have the master on the console and bring up tracks that weren't used, or isolate others to highlight something.
I don't have any real studio experience, but have messed with Tascam recorders and a DAW program.
I have seen many music videos where the engineer presses a button and the sliders snap to or from a position. I assume this is some preset the engineer likes.
When a song is actually being mixed, assume the guitar comes in a little hotter than expected for the first 10 seconds and they want to keep the take, but just even it out a bit. In the old days, when they create the final mix, do they do it manually? Or is is bounced to another track the way they want it and it's now "fixed"? What about with with the modern studios, can the board remember to pot it down for a bit and bring it back up? This is one track, what about multiple tracks, correcting/adjusting for various things? And then, running it over and over again through all the tracks. How was/is this done? Like I said, my experience is mostly with the portastudio, and I would do it manually in the moment, but I was only making demo recordings, not Classic Albums.
thanks