void setup() {
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);

}

void loop() {
   noTone(7);
  tone(8,3080,200);
  delay(130);

  noTone(8);
  tone(9,880,200);
  delay(150);

  noTone(9);
  tone(10,988,300);
  delay(190);

  noTone(10);
  tone(7,1047,300);
  delay(200);

}