- http://astronomy.swin.edu.au/~pbourke/analysis/dft/
- http://www-ccrma.stanford.edu/~jos/mdft/
- http://www.wikipedia.org/wiki/Fast_Fourier_Transform
- http://www.dspdimension.com/
- http://www.cage.curtin.edu.au/mechanical/info/vibrations/tut1.htm
- http://www.eptools.com/tn/T0001/INDEX.HTM
- http://www.fftw.org/links.html
- http://www.ulib.org/webRoot/Books/Numerical_Recipes/bookcpdf/c12-1.pdf
- http://www.ulib.org/webRoot/Books/Numerical_Recipes/bookcpdf/c12-2.pdf
- http://www.dspguide.com/
Peter Elsea has written a tutorial on FFT in Max.
via the MaxMSP list