#include <pitches.h>

const int pianoKeys[] = {8,7,6,5,4,3,2};

#define speaker 12

void setup() {
  for(int i = 0; i < 9; i++) {
    pinMode(pianoKeys[i],INPUT_PULLUP);
  } 
  pinMode(speaker, OUTPUT);
}

void loop() { 
  int soundOutput = 0;
  for(int i = 0; i < 9; i++) {
    soundOutput = pianoKeys[i];
  }

  if(soundOutput){
    tone(speaker, soundOutput);
  }else{
    noTone(speaker);
  }

}