I would try the Music-dsp list here:
http://music.columbia.edu/cmc/music-dsp/
The other thing that might help is the book "Elements of Computer Music" by F. Richard Moore.
I did some FFT research back in the day, but it's been a while and I don't remember very much of it - I'm not sure who else on here would be into that sort of thing...
HTH!
Tim