How to get input from Microphone and played it back through the headphone.

Hello,

I am a postgraduate student workin on human-machine interface. I have
problem to get input from microphone and get the output from the
headphone. I have tried example from Rulph Chassaing book for C6713 and
C6416 DSK example 2.1. I have compiled the program, and it came out as
no errors. I have also change the set-up register 4 from 0x0011 to
0x0015 in both c6713dskinit.h and DSK6713_AIC23.h but still no sound
heard at the headphone line. I am totally confused. Please advise what
should I do as I need to do other parts of my thesis as well. I running
out of time. Your kind help is very much appreciated. Start a New Thread