Multiple overlays active?

[ozzlvlosis]

Hey gang

Is there a way to have more than one overlay active at the same time without changing the opacity?
I'm trying to have a few different snow overlays (chroma key)
obviously if i change the opacity I would be hardly able to see it and if theyre all at 100% only the top overlay will be visible

thanks for reading

[asik1]

a screen shot of your project may help