Tell us about yourself!
Check out this older article claims it does it w/no programming using concept similar to what the guy is trying to do.http://www.best-microcontroller-projects.com/sound...I would think that some company would be putting out off the shelf shields by now.
I did something like this and found I get better results if one of the mics has opposite polarity from the other. This creates a better stereo effect. Also some suggestions I have seen on this say that strapping a small ceramic cap across the leads will improve the sound quality. It would be nice to see someone post a schematic diagram of their connections.