I'm currently working on a composition of 6432 x 1920 @ 25 FPS using lots of slices for mapping ... My FPS are dropping really fast using only a couple of layers (even if I downsize these). Just wondering how many layers (full comp resolution) you can run at these specs before the dropping begins ...

All my layer mixing modes are set to Alpha. When trying to select a different one, I get:
"no choices"

I would love to be able to midi map the bypass button for a mask in the composition / layer properties