I’m actually not the biggest fan of blend_overlay because it adjusts the opacity of the mask rather than adjusting the intensity of the mask colors, making it look pretty weird in a lot of situations.
I think @hunterk posted instructions for how to make blend_overlay do a straight multiply but I never got around to trying it and it’s since been buried in this thread (things get buried fast around here).
EDIT:
Here you go- Please show off what crt shaders can do!