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@kentpitman @rwxrwxrwx
otherwise, people often use bordeaux-fft, which are length two (trivial) composite ffts, or else go to C's (Burrus') fftw. I think series-optimised lisp native fft generation sounds exciting. With Series' laziness, it could even add a Goertzel's-like dimension (only evaluating targetted bins through laziness).