When changing the opacity of a subtracted mask, it doesn't fade the masked region, which is what I'm looking for, it fades the outside of the mask. I know this can be done, but can't seem to make it happen. Anyone have the solution?
Mask the entire layer with a mask over everything first the subtract with a second mask. this does what you want. the mask order is important in this. so have the "add everything" mask at the top.