int soundsensor = 12;
int led1 = 2;                // defining pin numbersvoid setup() 
int led2 = 3;
int led3 = 4;
int led4 = 5;

void setup() {
  pinMode (soundsensor, INPUT);
  pinMode (led1, OUTPUT);
  pinMode (led2, OUTPUT);
  pinMode (led3, OUTPUT);
  pinMode (led4, OUTPUT);
  
}

void loop()
{
  int sensorvalue = digitalRead (soundsensor);            //if the sound intensity is higher than threshold which is set by us, 
                                                          //then sensor would return the value as 1
  if (sensorvalue == 1)                                    
  {
    digitalWrite(led1, HIGH);
    digitalWrite(led2, HIGH);
    digitalWrite(led3, HIGH);
    digitalWrite(led4, HIGH);
  }
  
  else
  {
    digitalWrite(led1, LOW);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);
    digitalWrite(led4, LOW);
  }
  
}