> What I really wanted was to be able to do it on a chip and then have it 
> process sound real-time.  That would have helped me see the application 
> much more clearly.

If you have a fast enough computer and use a fast enough language you should 
be able to do some pretty funky stuff on your home PC with the line/mic 
input and the speaker output of your sound card.  I would recommend using 
C++ and the ASIO driver/protocol - it's really fast (very low latency) and 
easy to code for.

As an aside, I looked into this recently because my transmitter for a radio 
controlled helicopter outputs a PWM signal that can be connected to the PC's 
audio input.  I tried to process this data using the standard Windows API 
calls for recording audio and then DirectSound, but they were *way* too slow 
(when trying to control a helicopter, even a 200 ms delay on the controls 
makes it very hard to control, I was seeing more like 500 ms).  I found the 
ASIO drivers and it worked perfectly with seemingly instant response time, 
now I can use the RC simulator with my own controller!

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