This is one of the pieces of code that I’ve delayed posting for a long time. For those that wanted it I’m deeply sorry that it has taken me this long.

This is a Script that really only works is you have all the pieces.

So first you need the plugin for winamp that Maceger provided to me.

http://www.macetech.com/wa502_sdk.zip

also my version is available on my download page

** for this to work you need to download and open the project in visual studio and do a search for “COM” and change it to your COM port of your computer. Then compile the dll, and put it into the  C:\Program Files\Winamp\Plugins folder ***

second you need softPWM (optional)

http://arduino.cc/forum/index.php/topic,19451.0.html

if you chose not to use it you will need to change SoftPWMSet to digitalWrite, and remove all SoftPWM code.

support topics on my project can be found at the fallowing links.

http://arduino.cc/forum/index.php/topic,40078.msg293360.html#msg293360

http://arduino.cc/forum/index.php/topic,27482.msg203610.html#msg203610

UPDATE:: source code.zip

 /*#################################################
 ### --- Winamp + arduio vu meter ---- ###
 ### --- Copyright 2010 - Dave Johnson --- ###
 ###--- Dave@SilverCG.com - www.SilverCG.com --- ###
 ###_____________________________________________###
 ### --- this code includes a vu meter based off ###
 ### data from winamp and converts it to 3 rows ###
 ### of multiplexed leds. ---- ###
 #################################################*/
#include 

#define DELAY 80

int colpins[] = {2,3,4,5,6,7,8,9,10};
 int rowpins[] = {11,12,13};
 int power = 1;
 //---------------------------------------------
 long timer;
 const long muxInterval = 10;
 int mux = 0;
 int full[27];
 float lvl;

void setup() {
 Serial.begin(57600);
// for (int pin=0; pin<9; pin++) {
// pinMode( colpins[pin], OUTPUT );
// }
 for (int pin=0; pin<3; pin++) {
 pinMode( rowpins[pin], OUTPUT );
 }
 timer = millis();
 
SoftPWMBegin();

  for (int i = 0; i < 9; i++){
    SoftPWMSet(colpins[i], 0);
  }
}
void loop(){

int divide = 5;
 //------------------------------------------------------------
 float total; // for calculations below. <>
 int data[9]; // raw serial data <>

if (Serial.available() >10) {
 byte i = Serial.read();
 if (int(i) == 255) {
 for (int c = 0; c < 9; c++){
 data[c] = int(Serial.read());

}
 }
 }
 // some math -------------

lvl = (data[0] + data[1] + data[2] + data[3] + data[4] + data[5] + data[6] + data[7] + data[8]) / 9;
 //lvl = (data[1] + data[2] + data[3]) / divide;
 //lvl2 = (data[0] + data[7] + data[8]) / divide;
 //lvl3 = (data[4] + data[5] + data[6]) / divide;
 // math end -----------------

// reset leds ---------------
 for (int i = 0; i < 27; i++){ full[i] = 0; } 
 
 int length = 5; // sets how long the tail is, so as the meter goes up there is 9 or less leds on at a times... 
 // feel free to change this to what you like. 
 // ------------------------------- 
 int mapvalue2; 
 int mapvalue = map(lvl, 0, 255, 0, 27); 
 if (mapvalue >= length){
 mapvalue2 = mapvalue - length + 1;
 }
 if (mapvalue < length) {
 mapvalue2 = 0;
 }
 for (int x = mapvalue2; x <= mapvalue; x++){
 full[x] = 1;
 }
 // set leds end--------------

// patterns feel free to change these to what ever you want the posiblities are endless. 0 - 26 is equel to 27 leds..

// int meterlist[9]= {full[0], full[1], full[2], full[13], full[14], full[15], full[16], full[17], full[26]};
// int meterlist2[9] = {full[5], full[4], full[3], full[12], full[11], full[20], full[19], full[18], full[25]};
// int meterlist3[9] = {full[6], full[7], full[8], full[9], full[10], full[21], full[22], full[23], full[24]};
//
//int meterlist[9]= {full[0], full[1], full[2], full[3], full[4], full[5], full[6], full[7], full[8]};
//int meterlist2[9] = {full[17], full[16], full[15], full[14], full[13], full[12], full[11], full[10], full[9]};
//int meterlist3[9] = {full[18], full[19], full[20], full[21], full[22], full[23], full[24], full[25], full[26]};


int meterlist[9]= {full[2], full[3], full[8], full[9], full[14], full[15], full[20], full[21], full[26]};
int meterlist2[9] = {full[1], full[4], full[7], full[10], full[13], full[16], full[19], full[22], full[25]};
int meterlist3[9] = {full[0], full[5], full[6], full[11], full[12], full[17], full[18], full[23], full[24]};

//int meterlist[9]= {full[0], full[6], full[12], full[18], full[5], full[11], full[17], full[23], full[26]};
//int meterlist2[9] = {full[1], full[7], full[13], full[19], full[4], full[10], full[16], full[22], full[26]};
//int meterlist3[9] = {full[2], full[8], full[14], full[20], full[3], full[9], full[15], full[21], full[26]};

//map to 9
//int meterlist[9]= {full[0], full[1], full[2], full[3], full[4], full[5], full[6], full[7], full[8]};
//int meterlist2[9]= {full[0], full[1], full[2], full[3], full[4], full[5], full[6], full[7], full[8]};
//int meterlist3[9]= {full[0], full[1], full[2], full[3], full[4], full[5], full[6], full[7], full[8]};

//int meterlist[9]= {full[26], full[16], full[14], full[4], full[2], full[8], full[10], full[20], full[22]};
//int meterlist2[9] = {full[24], full[18], full[12], full[6], full[0], full[6], full[12], full[18], full[24]};
//int meterlist3[9] = {full[22], full[20], full[10], full[8], full[2], full[4], full[14], full[16], full[26]};

//multiplex drawing.
 if (millis() - timer < muxInterval) { timer = millis(); mux++; if (mux > 2){
 mux = 0;
 }
 for (int i = 0; i <=8; i++){ 
 SoftPWMSet(colpins[i], 0);
 } digitalWrite(rowpins[0], LOW); 
 digitalWrite(rowpins[1], LOW); 
 digitalWrite(rowpins[2], LOW); 
 if (mux == 0) { for (int i = 8; i >= 0; i--) {
 if (meterlist[i] == 1){
 SoftPWMSet(colpins[i], power, true);
 digitalWrite(rowpins[0], HIGH);
 }

}
 }
 if (mux == 1) {

for (int i = 8; i >= 0; i--) {
 if (meterlist2[i] == 1){
 SoftPWMSet(colpins[i], power, true);
 digitalWrite(rowpins[1], HIGH);
 }

}
 }
 if (mux == 2) {

for (int i = 8; i >= 0; i--) {
 if (meterlist3[i] == 1){
 SoftPWMSet(colpins[i], power, true);
 digitalWrite(rowpins[2], HIGH);
 }

}
 }

}

}