Set operations using Rotobrush and Masks question

Hi everyone
I have a relatively simple video clip of an object rotating. Its shot straight on, no fancy moves or anything just rotating. I've rotobrushed it and it looks good on a plain white background. I'm animating a color shift such that as the object rotates its top 1/3rd part changes colors. The area changing colors has crinkly edges but I've used rotobrush to isolate that as well, no problems there. I duplicated the original clip, rotobrushed the duplicate to separate it from the background. The original clip fades into pure white leaving the rotobrushed layer visible. I duplicated the original again, rotobrushed the top 1/3rd in the same way. I created a new layer with just a color adjustment effect and used the rotobrushed top 1/3rd as a track-mask for the animated color adjustment layer.
What I want to do is run a color gradient that shifts colors same as the top part but bleeds into the lower part that does not change colors.
So, is it possible to use a regular mask for the gradient and do a difference operation with the rotobrush of the object so the gradient only effects the area below the top 1/3rd which changes color ? I know I can do it with regular masks, but I can't figure out how to do it with rotobrush masks. I want to be able to do intersections and unions.
any pointers would be greatly appreciated. Thanks
-AK

Wrong thinking. You need to get away from masks vs. Rotobrush. In the end, all you do is create matte channels and therein lies the answer - any channel can be mangled with effects, possibly requiring to be extracted and isolated first by pre-rendering or pre-comping. RB and masks are just means to an end/ tools, nothing more.
Mylenium

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C
¦
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Copyright (c) 1982, 2005, Oracle. All rights reserved.
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©
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Copyright (c) 1982, 2005, Oracle. All rights reserved.
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Copyright (c) 1982, 2005, Oracle. All rights reserved.
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Copyright (c) 1982, 2005, Oracle. All rights reserved.
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C
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¦
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