I'm now finishing the first stage of the development of my own guitarsynthesizer system. It uses a Teensy3.1, and a simple hexbufferchip to get the string separated audio into the ADC's. It converts 6 streams of incoming audio into midi.
Thanks PJRC for your great product, the Teensy 3.1. Also special thanks to Pedvide for making the usage of the ADC such a breeze!