Can't believe it's been more than a year already since this was requested.
Compiling such a list was always on my to-do list back then but I never got around to it - it doesn't help that I don't have a lot of leisure time nowadays.
Theater Modes are probably the only department on this forum that still lacks a thread dedicated to grouping *all* of its workings and explanations that are scattered around.
The readme file in the plugins directory is a great place to start for someone wanting to learn - there's more to be added to the information in that file.
Former forum user @Redwing did a marvelous job at putting together most of the threads/explanations on this board.
Hopefully, I or someone else will someday get around to grouping all of those bits into one massive forum guide.
Here you go: https://getmusicbee.com/forum/index.php?topic=39780.msg215036#msg215036