[jitter] compositing matrices per pixel

And here's the example, the main stuff is in 'parts' subpatch.
The 'control' matrix comes into right inlet of jit.repos. The  
'control' matrix is created in main patch, by simplifying input from  
qt.movie.
Each color (red,green,blue,yellow) represents one layer. Instead of  
color matrices, 4 jit.qt.movies can be used as layers, creating a  
sort of collage...

-nesa

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#P outlet 50 130 15 0;
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#P connect 3 0 4 1;
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#P connect 1 0 0 0;
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#P connect 1 0 4 0;
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