audio .......................

how can i check if their is any audio playing?

Turn on your speakers or plug in headset, make sure the volume is up, and listen? What do you mean?

var aSource : AudioSource = gameObject.GetComponent(AudioSource);
function Update()
{
 if(aSource.isPlaying)
 {
  Debug.Log("There is some sound playing, coming from "+this.gameObject.name);
 }
}

This will help print every frame if there is sound coming from the object;