code: @Override
  	public void handleRequest(final Request request) {
  		super.handleRequest(request);
  
  		if (isDisabled()) {
  			return;
  		}
  
  		String targ = request.getParameter(Environment.TARGET_ID);
  		String audioFileRequested = request.getParameter(AUDIO_INDEX_REQUEST_PARAM_KEY);
  		boolean contentReqested = targ != null && targ.equals(getTargetId());
  
  		if (contentReqested) {
  			int audioFileIndex = 0;
  
  			try {
  				audioFileIndex = Integer.parseInt(audioFileRequested);
  			} catch (NumberFormatException e) {
  				LOG.error("Failed to parse audio index: " + audioFileIndex);
  			}
  
  			Audio[] audio = getAudio();
  
  			if (audio != null && audioFileIndex >= 0 && audioFileIndex < audio.length) {
  				ContentEscape escape = new ContentEscape(audio[audioFileIndex]);
  				escape.setCacheable(!Util.empty(getCacheKey()));
  				throw escape;
  			} else {
  				LOG.error("Requested invalid audio clip: " + audioFileIndex);
  			}
  		}
  	}
docs: When an audio element is rendered to the client, the browser will make a second request to get the audio content.
  The handleRequest method has been overridden to detect whether the request is the "content fetch" request by
  looking for the parameter that we encode in the content url.
  
  @param request the request being responded to