https://leandrolinares.com/blog/arduino-midi-controller/ Building an Arduino MIDI ControllerI'm a beginner in all things Arduino and I've been working on an easy, fast, and cheap project to learn more about it.leandrolinares.com #include "MIDIUSB.h"const byte TOTAL_BUTTONS = 16;// All the Arduino pins used for buttons, in order.const byte BUTTONS_PIN[TOTAL_BUTTONS] = {2,3,4,5,6,7,8,9,10,11,12,A0..