Sorry, no cool picture to go along with this. But, we think its pretty cool anyways. We just finished a really fast FFT library for the Arduino platform. This means you can do frequency analysis of your audio data in real time. It can take input from the ADC or from the CodecShield, and output up to 128 real frequency bins at a 7ms update rate. These bins can be set to linear or logarithmic output, and there is even an octave mode, where the frequency bins double in width as they go up the scale (perfect for making a graphic EQ). Check it out, and let us know how it works for you.