A patch made in Pd extended to create visual feedback loops in GEM. Example below:

You can now mask the feedback, revealing the original video source underneath (this can be inverted).

I'm attempting to create the different wipe effects found on hardware video mixers such as the

. If anyone can improve this patch please do so (and share it ;-) )

http://www.pdpatchrepo.info/hurleur/feedback.pd