The Codec Shield breaks out all of the useful pins on the WM8731 including the mic, line-in and out, headphone, and midrail bias voltage pin. It also has 1/8" stereo input and headphone out jacks as well as a pair of potentiometers for modulating parameters in your code.
The shield uses SPI to communicate with the WM8731 so it won't work directly with the Arduino Mega, but getting started on an Arduino-UNO style board or LeafLabs Maple is easy! Just download the library and example code, hook up and audio source and start tweaking.
Obviously you don't have much time to execute code between audio samples, so your code will need to stay pretty slim, but the example code gives a great framework for how your code should flow. Open Music Labs claims a performance increase of 4x when running the shield on a Maple (thanks to the higher clock speed).
If you are interested in Internet of Things (IoT) or M2M projects check our open source sensor platform Waspmote which counts with more than 100 sensors available to use 'off the shelf', a complete API with hundreds of ready to use codes and a low consumption mode of just 0.7µA to ensure years of battery life.
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