I was looking at the Chebychev polynomials mentioned in one of the tutorial patches, which can double, triple, etc. the frequency of a pure sine wave of amplitude 1. I wondered what would happen if I were to do this over and over again in a delay loop, so I created this patch. If you have the input frequency low (say, <1Hz) and the delay time low (I made it as low as possible, about 1-2ms) and if you use the higher-order Chebychev polynomials, then you get really weird, chaotic behavior.

http://www.pdpatchrepo.info/hurleur/FX_74a_-_iterative_chebyshev.pd

that's pretty damned cool.

Gives out some very glitchy noises.