bool p_value[7] = {0, 0, 0, 0, 0, 0, 0};
int p_amp = 0;
int p_wf = 0;
float w = 0.8; // weighting factor for analogRead filter 0-1
int m = 2; // minimum difference to change value

// the setup routine runs once when you press reset:
void setup() {
  Serial.begin(9600);
  // initialize the digital pin as an input.
  for (int i = 0; i < 7; i++) {
    int pin = i + 3;
    pinMode(pin, INPUT_PULLUP);
  }
}

// the loop routine runs over and over again forever:
void loop() {
  for (int i = 0; i < 7; i++) {
    int pin = i + 3;
    bool value = !digitalRead(pin);
    if (value != p_value[i]) {
      if (value) {
        Serial.print("noteON ");
        Serial.println(String(i));
      } else {
        Serial.print("noteOFF ");
        Serial.println(String(i));
      }
    }
    p_value[i] = value;
  }

  int amp = w * analogRead(A4) + (1 - w) * p_amp; // analogRead with exponential filter
  if (abs(amp - p_amp) > m ) {
    Serial.print("setAmp ");
    Serial.println(String(amp));
  }
  p_amp = amp;

  int wf = map(analogRead(A5), 0, 1020, 0, 4);
  if (wf != p_wf) {
    Serial.print("setWf ");
    Serial.println(String(wf));
  }
  p_wf = wf;

}