title: How to merge 4 audio file in 1 audio file iOS
body: <p>I have created application in which i want four audio file and i have got full URL path of that audio file.
  Here is the code for that</p>
  
  <pre><code>//Audio 1
  NSURL *outputFileUrl1 = [NSURL fileURLWithPath:outputFilePath1];
  NSLog(@"Output Audio file 1 URL : %@",outputFileUrl1);
  
  //Audio 2
  NSURL *outputFileUrl2 = [NSURL fileURLWithPath:outputFilePath2];
  NSLog(@"Output Audio file 2 URL : %@",outputFileUrl2);
  
  //Audio 3
  NSURL *outputFileUrl3 = [NSURL fileURLWithPath:outputFilePath3];
  NSLog(@"Output Audio file 3 URL : %@",outputFileUrl3);
  
  //Audio 4
  NSURL *outputFileUrl4 = [NSURL fileURLWithPath:outputFilePath4];
  NSLog(@"Output Audio file 4 URL : %@",outputFileUrl4);
  </code></pre>
  
  <p>Now, i want to merge this all four audio and play it as a one single audio.
  any code snippet will be appreciated.</p>