How do you make an automatic seekbar/scrubber?

Question

Hi there,
              I have made my own functional mp3 media player in actionscript 3.0 where I can play a song, and I have a seekbar/scrubber which I can scrub through the song.
The question I am now asking as I have searched many forums and on google, is how I can make the seekbar/scrubber move with the song automatically.
Any help is appreciated, Thanks Casey
// Variable List
var my_songs:XMLList; // create variable for reference to XML nodes in playlist
var my_total:Number; // create variable to hold number of songs in playlist
var my_sound:Sound; // create variable to hold sound object
var my_channel:SoundChannel; // create variable to hold sound channel object
var dragging:Boolean = false; // boolean to detect state of vol slider drag
var isDragging:Boolean = true; // boolean to detect state of scrubber/seekbar
var rectangle:Rectangle = new Rectangle(0,-75,0,75); // place vol slider objects
var rectangle2:Rectangle = new Rectangle(0,0,685.5,0);
var current_song:Number = 0; // current song counter (first position in the array)
var song_position:Number; // song position
var song_paused:Boolean; // is song paused? true or false?
var myXMLLoader:URLLoader = new URLLoader(); // variable to hold the URLLoader class
var pausePosition:int=0;
// seekbar ui controls setup
seekBar_mc.sliderSeek_mc.buttonMode = true;
seekBar_mc.sliderSeek_mc.addEventListener(MouseEvent.MOUSE_DOWN, dragIt2); // call drag function
stage.addEventListener(MouseEvent.MOUSE_UP, dropIt2); // call drop function
// function dragIT2
// dragging slider
function dragIt2(e:Event):void
          e.currentTarget.startDrag(true, rectangle2); // seek bar of rectangle constrained
          isDragging = true; // flip the boolean value to true (dragging)
          seekBar_mc.sliderSeek_mc.addEventListener(Event.ENTER_FRAME, onPlayProgress); // call the onPlayProgress function
// function dropIT2
// dropping slider
function dropIt2(e:Event):void
          if (song_paused == false)
                    if (isDragging == true)
                              stopDrag();
                              var fullTime:int = Math.floor(my_sound.length/1000);
                              //my_sound.length:int = Math.ceil(my_sound.length /(my_sound.bytesLoaded / my_sound.bytesTotal));
                              var newPos:Number = fullTime/685.5 * Math.floor(seekBar_mc.sliderSeek_mc.x * 1000);
                              pausePosition = newPos/2;
                              my_channel.stop();
                              gotoAndPlay(2);
                              my_channel = my_sound.play(newPos);
                              song_paused = false;
                              isDragging = false;
          }else
                    isDragging = false;
                    seekBar_mc.sliderSeek_mc.stopDrag();
                    //seekBar_mc.sliderSeek_mc.visible = false;
                    //pausePosition = _totalTime / 100 * Math.floor(seekBar_mc.sliderSeek.mc.x * 1000);
// onPlayProgress
function onPlayProgress(event:Event):void
          var seekbar:Number = seekBar_mc.sliderSeek_mc.x / 100; 

Answer 1

create a loop (eg, enterframe) and repeatedly use your soundchannel's position property to update your play indicator.