![](/media/cache/profiles/d7a6170fcd40c9d43be7eb83295b0324.50x50_q85.jpg)
voice changer, contains echo, change low voice and high voice.
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