Check out video from Elwick, he goes over how to use it from version 4.2, things have changed slightly (you use the “Levels” window now instead of world composition, and it is there automatically, you don’t need to turn on an experimental ) but for the most part it is the same, and it works the way he explains it. The audio is a bit weird, but does not affect the video much.
https://www…com/watch?v=■■■8vLosDLY
There still needs to be better documentation I agree, but hopefully helps you get started! 