voice changer, contains echo, change low voice and high voice.

Dependencies:   mbed

condenser microphone connect to p16, audio amplifier and speaker connect to p18, and pull-upped switch connect to p5 for chage voice of low voice, high voice and ecoed voice.

test video-> http://youtu.be/z-7Hj0u6OlA

/media/uploads/hayama/2014-08-11_20.21.54.jpg

main.cpp/shortlog@f4cbe4a0f1be: not found in manifest