An advice...
The graphs r good. I know a solution 4 the talking sounds. If you want,mail me:hamush@buec.ee.boun.edu.tr and I will send u a program,TalkAny... This program talks really good English. I haven't a full version but this demo is fine,too. I'm using it already and well,it may even talk other languages such as Turkish if you know how to. No need to use the real human sound, if you don't have a very fine microphone.