unsigned int toneFrequency = 0UL;

void setup() {
  pinMode(A1, INPUT);
  pinMode(A2, INPUT);
  pinMode(A3, INPUT);
  pinMode(A4, INPUT);
  pinMode(A5, INPUT);
  pinMode(2, OUTPUT);
  pinMode(8, OUTPUT);

  digitalWrite(2, HIGH);
}

void loop() {
  if (digitalRead(A1))
    toneFrequency = 200;
  else if (digitalRead(A2))
    toneFrequency = 400;
  else if (digitalRead(A3))
    toneFrequency = 600;
  else if (digitalRead(A4))
    toneFrequency = 800;
  else if (digitalRead(A5))
    toneFrequency = 1000;
  else
    toneFrequency = 0;

  if (toneFrequency > 0)
    tone(8, toneFrequency);  //tone(pin, frequency)
  else
    noTone(8);

  delay(100);  // Debounce delay to avoid multiple readings from the button
}