Referências
https://gist.github.com/pklaus/5921022
https://create.arduino.cc/projecthub/electrosmash-team/arduino-due-programmable-guitar-pedal-edfe8b
https://www.electrosmash.com/pedalshield
https://www.arduino.cc/en/Reference/ArduinoSound
http://www.djerickson.com/arduino/due_adc.html
https://www.arduino.cc/en/Guide/ArduinoDue
Pinos Arduino Due
