Gunshot Sound Playing Too Many Times

I have a gun working right, and this is probably something simple I'm missing, but here goes. I have tried multiple version and the only one that plays any sound at all plays way too many. Its quite awful. All i want is for it too play the sound and continue to loop it until the gun is not firing anymore. For me it just plays a million sounds at a time. I am using the machine gun sound from the Angry Bots demo. Any ideas?

 var firing : boolean = false;
 
 var accuracy : float;
 
 
 private var bulletCaseGenerator : Transform;
 
 private var bulletTraceGenerator : Transform;
 
 private var muzzleFlashGenerator : Transform;
 
 private var bulletCaseGeneratorScript : bulletCaseGenerator;
 
 private var bulletTraceGeneratorScript : bulletTraceGenerator;
 
 private var muzzleFlashGeneratorScript : muzzleFlashGenerator;
 
 function Start(){
     
     bulletCaseGenerator = transform.Find("bulletCaseGenerator");
     
     bulletTraceGenerator = transform.Find("bulletTraceGenerator");
     
     muzzleFlashGenerator = transform.Find("muzzleFlashGenerator");
     
     bulletCaseGeneratorScript = bulletCaseGenerator.GetComponent("bulletCaseGenerator");
     
     bulletTraceGeneratorScript = bulletTraceGenerator.GetComponent("bulletTraceGenerator");
     
     muzzleFlashGeneratorScript = muzzleFlashGenerator.GetComponent("muzzleFlashGenerator");
     
     firing = false;
     //accuracy = 0.9;
 }
 
 function Update () {
     
     bulletCaseGeneratorScript.on = firing;
     
     bulletTraceGeneratorScript.on = firing;
     
     muzzleFlashGeneratorScript.on = firing;
     
     bulletTraceGeneratorScript.accuracy = accuracy;
     
     firing = false;
     
 
 
     
 }
 
 function Fire(){
     firing = true;
     
     animation.Play("gunFIRE");
     
     audio.Play();
     
 
 }
 
 function SetAccuracy(accuracyValue : float){
     
     accuracy = accuracyValue;
 }