Music Slider hookup?

I'm trying to make an options menu in which there is an audio slider that alters the volume level of the main menu. I've looked this up and it looks fool proof, I'm embarrassed that I can't get this but it must be something really simple. This is effectively how its rigged up right now, I'm using Javascript.

 #pragma strict
 var pauseText : String;
 var paused : boolean;
 var optioned : boolean;
 var volume : float;
 var musicSlider : float;
 
 function Start () {
     pauseText = "Pause";
     paused = false;
     optioned = false;
 
     volume = 100.0f;
     musicSlider = 100.0f;
 }
 
 function Update () {
 
     audio.volume = musicSlider;
 
 
     if (paused == true){
         Time.timeScale = 0;
         } else {
             Time.timeScale = 1;
             }    
             
 
 }
 
 function OnGUI () {
     if (GUI.Button (Rect (240,420, 70, 40), pauseText)) {
     paused = true;
     }
     
     //DEALS WITH THE MAIN PAUSE MENU
     if (paused == true){
     (GUI.Box (Rect (50,50, (Screen.width - 50), (Screen.height - 50)), (" ")));
         //This is the ONGUI code for the Options menu
         if (optioned == true){
         
             musicSlider = GUI.HorizontalSlider (Rect (((Screen.width * 0.5) - 50), ((Screen.height * 0.5) + 20), 100, 40), musicSlider, 1.0, 10.0);
                     
             if (GUI.Button (Rect (((Screen.width * 0.5) - 35),((Screen.height *0.5) - 100), 70, 40), "Menu")) {
                  Application.LoadLevel("StartScreen");
             }
             
             if (GUI.Button (Rect (((Screen.width * 0.5) - 35),((Screen.height *0.5) - 50), 70, 40), "Back")) {
                  optioned = false;
             }
         //This is the ONGUI code for the Main menu
         } else {
     
             if (GUI.Button (Rect (((Screen.width * 0.5) - 35),((Screen.height *0.5) - 100), 70, 40), "Menu")) {
                 Application.LoadLevel("StartScreen");
             }
             
             if (GUI.Button (Rect (((Screen.width * 0.5) - 35),((Screen.height *0.5) - 50), 70, 40), "Resume")) {
                 paused = false;
             }
             
             if (GUI.Button (Rect (((Screen.width * 0.5) - 35),((Screen.height *0.5)), 70, 40), "Options")) {
                 optioned = true;
             }
         }
     }
 }

Right now whats going on is that the audio kicks on at full blast (which is to be expected with how i set them to full in the beginning.) Hitting pause does pause the game, but moving adjusting the slider does nothing to effect the volume. In fact really everything that isn't the volume slider, and that has actually been implemented, functions as I expect it to. Do I need to call it differently in the update or ongui function?