adc => BLowd'sProgram => Flute => dac;

Good idea.  Check out work by Xavier Serra's
group at Barcelona on vocal-controlled synthesis.
Possibly Alex Loscos, or others, but definitely
from the UPF (Universitad Pompeu Fabra).  Maybe
ICMC, DAFX, or some Euro Signal Processing/music
conferences.  Lemme know if you don't turn 
anything up.

Check the various pitch detectors in the Pitch
directory in the /src tree of the course web pages.

Forge Ahead!!

(Oh yea, and do that demo video of binaural robot :-)