int sensorPin = A0;    // select the input pin for the electret mic

int ledPin = 9;    // LED connected to digital pin 9

int volume = 0;  // variable to store the volume level value coming from the sensor

int volume2 = 0;  // variable to store the volume level value coming from the sensor – mapped to a range of 0-255

int volume3 = 0;  // variable to store the volume level value coming from the sensor – mapped to a range of 0-255

int delayTime = 10;

int ledPin2 = 10;

void setup() {

  Serial.begin(9600);

}

void loop() {

   volume = analogRead(sensorPin);   

 // volume=abs(volume-1000);  // look at the base value when room is quiet and subtract by that amount – it may not be 760

 //if (volume < 760) {

 if (volume < 740) {  // more sensative the higher the number ie,  800 + 390

    volume=abs(volume-410);  

    volume2 = map(volume, 0, 330, 0, 255); // if you need to subtract 760 (as suggested above), change the initial range to 0, 263 instead of 0, 1023

    // 390 more sensative than 350

    //760 – 410 =350

   volume2 = abs(volume2 – 254);

   

   volume3 = map(volume, 0, 350, 0, 255); // if you need to subtract 760 (as suggested above), change the initial range to 0, 263 instead of 0, 1023

   volume3 = abs(volume2 – 254);

   

   if (volume2 > 22) {

     analogWrite(ledPin, volume2);

      analogWrite(ledPin2, volume3);

     

   }

     else {

        analogWrite(ledPin, 0);

        analogWrite(ledPin2, 0);

     }

  

   

 // analogWrite(ledPin, volume);  

// Serial.print(volume);   

// Serial.print(“t”); //prints a tab

//  Serial.print(“t”); //prints a tab

// Serial.println(volume2);   

 } 

  // Serial.print(volume);   

 //  Serial.print(“t”); //prints a tab

 //  Serial.print(“t”); //prints a tab

  // Serial.println(volume2);  

   delay(delayTime);

   

//      volume = analogRead(sensorPin);   

//   // volume=abs(analogValue-760);  // look at the base value when room is quiet and subtract by that amount – it may not be 760

//   volume2 = map(volume, 0, 25, 0, 255); // if you need to subtract 760 (as suggested above), change the initial range to 0, 263 instead of 0, 1023

//   analogWrite(ledPin2, volume2);    

//   Serial.print(volume);  

//   Serial.print(“t”); //prints a tab

//   Serial.print(“t”); //prints a tab

//   Serial.println(volume2);  

//   delay(delayTime);

}

I just need to add some more LED inputs and change the sensitivity. 

I got my LED’s from sparkfun.com