Please share how to mask? I need that capability for sure!
Whew this was over 2 years ago and I never did finish it 
And it was also on Estlcam11 instead of 12. I have not tried it since then. Let me see if I can find anything else about how to do it.
I would start a new thread that will get a lot more attention than this old one. I know there are several people that do this type of operation a LOT more often than I do.