This version of Filter Blender has the capability of mixing modifications with a previous video frame. The original version by Steven Don could only use one mask or one set of percentage mixes. This version supports multiple masks and mixes. You can apply other filters to one area using a mask, then apply other mods to a different area using another mask, and so on. The original had, in my opinion, confusing options which mixed the current frame with saved frame B and applied the mask...