const int buttonPins[8] = {2,3,4,5,6,7,12,9};
const int buzzerPin = 10;
const int potPin = A5;
// Note Frequencies (C D E F G A B High C)
int notes[8] = {262, 294, 330, 349, 392, 440, 494, 523};

void setup() {

for(int i = 0; i < 8; i++){
pinMode(buttonPins[i], INPUT_PULLUP);
}

pinMode(buzzerPin, OUTPUT);
}

void loop() {

// Read potentiometer
int potValue = analogRead(potPin);

// Convert 0–1023 into pitch multiplier (0.5x to 2.0x)
float pitchFactor = map(potValue, 0, 1023, 50, 200) / 100.0;

bool notePlaying = false;

// Check each button
for(int i = 0; i < 8; i++){

if(digitalRead(buttonPins[i]) == LOW){   // LOW = pressed

  int adjustedFrequency = notes[i] * pitchFactor;

  tone(buzzerPin, adjustedFrequency);
  notePlaying = true;

  break;   // Only one note at a time
}
}

// If no buttons pressed then stop sound
if(!notePlaying){
noTone(buzzerPin);
}
}