title: Mixing Audio Files
body: <p>I have few audio files:</p>
  
  <ul>
  <li>f_1 - length 10 sec</li>
  <li>f_2 - length 3  sec</li>
  <li>f_3 - length 1  sec</li>
  </ul>
  
  <p>What I need is to find a way to mix(merge) f2 and f3 at particular section in f_1 (i.e. position which is equal to 6 sec)</p>
  
  <p>I was looking at Audio examples but they don't help me much so any ideas\references\ documentation that might help?</p>
  
  <p>Many Thanks!</p>