Control.ino

#include <AnalogMultiButton.h>

const int BUTTONS_PIN = A0; //14;
const int BUTTONS_TOTAL = 4;

// find out what the value of analogRead is when you press each of your buttons and put them in this array
// you can find this out by putting Serial.println(analogRead(BUTTONS_PIN)); in your loop() and opening the serial monitor to see the values
// make sure they are in order of smallest to largest
const int BUTTONS_VALUES[BUTTONS_TOTAL] = {0, 277, 437, 540};

// you can also define constants for each of your buttons, which makes your code easier to read
// define these in the same order as the numbers in your BUTTONS_VALUES array, so whichever button has the smallest analogRead() number should come first
const int OCTAVE_DOWN_BTN = 0;
const int OCTAVE_UP_BTN = 1;
const int ARROW_DOWN = 2;
const int ARROW_UP = 3;

// make an AnalogMultiButton object, pass in the pin, total and values array
AnalogMultiButton buttons(BUTTONS_PIN, BUTTONS_TOTAL, BUTTONS_VALUES);

// pass a fourth parameter to set the debounce time in milliseconds
// this defaults to 20 and can be increased if you're working with particularly bouncy buttons

int lastMillis = 0;

void setupControls() {

  pinMode(BUTTONS_PIN, INPUT);
}

void updateControls() {

  /* DIAGNOSTIC */
//  if (millis() - lastMillis > 100) {
//    lastMillis = millis();
//    Serial.println(analogRead(BUTTONS_PIN));
//  }
//  return;

  buttons.update();

  if (buttons.onPress(OCTAVE_DOWN_BTN)) {
    Serial.println("Octave DOWN");
    octave--;
  }
  else if (buttons.onPress(OCTAVE_UP_BTN)) {
    Serial.println("Octave UP");
    octave++;
  }
  else if (buttons.onPress(ARROW_UP)) {
    Serial.println("UP arrow");
    Keyboard.press(KEY_UP_ARROW);
    Keyboard.release(KEY_UP_ARROW);
  }
  else if (buttons.onPress(ARROW_DOWN)) {
    Serial.println("DOWN arrow");
    Keyboard.press(KEY_DOWN_ARROW);
    Keyboard.release(KEY_DOWN_ARROW);
  }
}