__NOTE__ With the release of iOS 4, Apple provides its own built-in FFT functionality in the Accelerate.h framework. USE THAT. ITS SO MUCH FASTER. * Please read the dope MIT license at the bottom of the page. * The FFT algorithm included was written by Ooura ( http://www.kurims.kyoto-u.ac.jp/~ooura/fft.html ), so all thanks and questions for the core of this project go in that direction. * This co