Howdy all,
A friend and I made a small patch for class demonstration to replicate the delay line used for Richard Serra and Nancy Holt's 1974 "Boomerang". The speed of the delay is such that the returning voice confuses the brain of the speaker causing slower speech and comprehension. It is a very simple, but elegant idea and everyone enjoyed trying it.
http://danomatika.com/blog/boomerang-for-pd/
Dan Wilcox danomatika.com robotcowboy.com