public void playAudio()
		{
			session.SetActive (true);

			player = AVAudioPlayer.FromUrl (url);

			AVAudioPlayerDelegate avDel = new AVAudioPlayerDelegate ();
			player.Delegate = avDel;

			player.Play ();
	
		}
		public void playAudio(string word)
		{
			var newURL = new NSUrl ("Audio_Files/"+word+".m4a");
			var backupURL = new NSUrl ("Audio_Files/oat.m4a");
			session.SetActive (true);

			try
			{
				player = AVAudioPlayer.FromUrl (newURL);
			}
			catch(Exception ex) {

				//just play a random word so it doesn't crash.  Used to determine gaps
				player = AVAudioPlayer.FromUrl (backupURL);
			}
			AVAudioPlayerDelegate avDel = new AVAudioPlayerDelegate ();
			player.Delegate = avDel;

			player.Play ();
		}