my audio is not looping even when it is set to loop

I wasn't able to reproduce your issue. Your method "works" but setting them looping cause sound glitches. Here's a rewrite of the same code. I tested it with two different sounds and it works good for me. All I did was slap this and an AudioSource on a game object, together with two clips for the script. Instead of waiting for a timer I am checking until the sound stops. I don't use looping sounds (since this will do the loop by itself). Also I call audio.Stop() between each clip as you can see below, but I doubt it would do any difference unless you were waiting and using a looping sound (as you were originally).

// This code was tested and seems to run fine on my machine.

 audio.playOnAwake = false;
 audio.loop = false;

 while (true) 
 { 
     audio.clip = clips[Random.Range(0, clips.length)]; 
     audio.Play();

     while (audio.isPlaying)
         yield;

     audio.Stop();
 } 

The conditional statement must be True for the while loop's code to be executed, but in your script there is:

  while (false)
  ... 

Edit: Maybe you should use this script and assign the clip when the player presses a button:

function Start () { audio.loop = true; }

where here is the code im using now this one my uncle gave me (he is a programer for a living) and it still stops at four shots we know its not the script and it is not a audio listener problem because i only audio lister in the level

// Plays back one of the audio choosing randomly between them. 
var clips : AudioClip[] = new AudioClip[1]; 
function Start () 
{ 
    DontDestroyOnLoad(this); 
    audio.playOnAwake = false; 
    audio.loop = false; 
    var vvv =0; 
    while (vvv<0) 
    { 
        audio.clip = clips[Random.Range(0, clips.length)]; 
        audio.Play(); 
        while (audio.isPlaying) 
            yield; 
        audio.Stop(); 
        vvv++; 
    } 
} 
@script RequireComponent(AudioSource)

can't you just set it to loop in the inspector ?

let me explain anyway. I needed to loop a audio clip (use wav...not mp3). my clip runs at 100bpm...So all i did was change the bpm in the inspector and added the clip twice in the list also in the inspector. And i set this in the script to a small value: AudioSettings.dspTime + 0.01F; Perfect looping sound. Hope this helps someone, because the looping function in unity in limited.

using UnityEngine; using System.Collections;

[RequireComponent(typeof(AudioSource))] public class AudioJacques : MonoBehaviour {

 public float bpm = 140.0F;
 public int numBeatsPerSegment = 16;
 public AudioClip[] clips = new AudioClip[2];
 private double nextEventTime;
 private int flip = 0;
 private AudioSource[] audioSources = new AudioSource[2];
 private bool running = false;
 void Start() {
     int i = 0;
     while (i < 2) {
         GameObject child = new GameObject("Player");
         child.transform.parent = gameObject.transform;
         audioSources[i] = child.AddComponent<AudioSource>();
         i++;
     }
     nextEventTime = AudioSettings.dspTime + 0.01F;
     running = true;
 }
 void Update() {
     if (!running)
         return;
     
     double time = AudioSettings.dspTime;
     if (time + 1.0F > nextEventTime) {
         audioSources[flip].clip = clips[flip];
         audioSources[flip].PlayScheduled(nextEventTime);
         Debug.Log("Scheduled source " + flip + " to start at time " + nextEventTime);
         nextEventTime += 60.0F / bpm * numBeatsPerSegment;
         flip = 1 - flip;
     }
 }

}