AudioSource.Pause not working?

my game pauses fine , but audioSource is not pausing why ? and in audiosource , playOnAwake is false.

 public bool isPaused;
     public GameObject pauseMenuCanvas;
     public AudioSource AC;
     public GameObject TouchToPlay;
 
 
     void Start () {
         pauseMenuCanvas.SetActive (false);
         TouchToPlay.SetActive (true);
         Time.timeScale = 0f;
     }
 
 
     void Update () {
         if (isPaused) {
             AC.Pause ();
             pauseMenuCanvas.SetActive (true);
             Time.timeScale = 0f;
         } else if(!isPaused){
             pauseMenuCanvas.SetActive (false);
             AC.UnPause ();
             Time.timeScale = 1f;
         }
         if (Input.GetKeyDown (KeyCode.P)) {
             isPaused = !isPaused;
         }
     }
 
 
     public void TouchPlay(){
         TouchToPlay.SetActive (false);
         Time.timeScale = 1f;
         AC.Play ();
     }