I was reading tweakheadz and he mentioned a method about putting a delay before a limited and running a vocal through the delay at an intensity that causes it to self oscillate (when the feedback is so high it starts to loop outta control and get more chaotic) but the limiter locks it down so it just keeps going and going like its gonna explode.
He mentioned doing this with vocals, but I'd imagine theres a lot of things you can self oscillate through a delay to get all sorts of different sounds.

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