// Stereo Sound

int leftPin = 3; // LED connected to digital pin 13 int rightPin = 11; // LED connected to digital pin 13

void setup() // run once, when the sketch starts {

  pinMode(leftPin, OUTPUT);      // sets the digital pin as output
  pinMode(rightPin, OUTPUT);      // sets the digital pin as output

}

void loop() // run over and over again {

  digitalWrite(leftPin, HIGH);   // sets the LED on
  digitalWrite(rightPin, HIGH);   // sets the LED on
  delay(1);                  // waits for a second
  digitalWrite(leftPin, LOW);    // sets the LED off
  delay(1);                  // waits for a second
  digitalWrite(leftPin, HIGH);   // sets the LED on
  digitalWrite(rightPin, LOW);   // sets the LED on
  delay(1);                  // waits for a second
  digitalWrite(leftPin, LOW);    // sets the LED off
  delay(1);                  // waits for a second

}