DIY mixer/key

[george lazenbleep]

Hey, does anyone know of any DIY visionmixer or keyers. Can't find anything, would love to build and mod my own.
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[Circuitbenders]

not quite what you're looking for but i'm assuming you've seen this:

http://www.karlklomp.nl/pro/vbend.html

[george lazenbleep]

yes i have, and i've tried quite a few of his 'dirty' ideas.
i'm really looking for a chip or kit solution for combining two vid signals synchronously, or keying in sync.
i use a vision mixer for both atm, but i'd really like to build, and mod, my own.

there's a little bit of vid here from my bent vid painter and bent nes
http://www.youtube.com/watch?v=l22hyqs3uCk