[Dave Horwell]

Hi there, I can’t be a lot of help with Boris as i have tended to use Ultimatte or the other bundled avid keyers. but i did think of something i have found useful with those keyers and it might work for you. If boris lets you ‘show alpha’ then do a video mix down of that key. Use the video mixdown as a matte key, then i think you will be able to use boris or avid’s 3d matte key to choke the key as you need.
Best of luck – sorry if this advice is a little vague but i’m not in front of an avid today – working on quantel 🙁

Dave