I don't remember any discussions on the mailing list about speech recognition. It's a very interesting topic for me -- because of chronic pain problems, I've used dictation software for years (in fact, I'm writing this using iListen from MacSpeech) -- but I haven't had time to explore it myself.
This thread on the electro-music.com forum has some useful pointers -- that guy is using chuck rather than SuperCollider, but the concepts are valid no matter what language you use.http://electro-music.com/forum/viewtopic.php?t=21647
A lot of audio analysis techniques convert frequency data to the Mel scale, because raw FFT data over emphasize high frequency content. Recently the MFCC UGen was created to produce "mel-frequency cepstral coefficients" from a basic FFT analysis. You might find this very useful.
Be patient with yourself -- this is hard, hard stuff to wrap your head around. I hope these are useful pointers in any case.