int pos=0;
void setup()
{
  pinMode(A0, INPUT);
  pinMode(8, OUTPUT);
  pinMode(A1, INPUT);
  pinMode(A2, INPUT);
}

void loop()
{
if(digitalRead(A0)==HIGH)  
{
  tone(8,440,100);
}
if(digitalRead(A1)==HIGH)
{
  tone(8,494,100);
}
if(digitalRead(A2)==HIGH)
{
  tone(8,523,100);
}
delay(10);
}