title: iOS audio manipulation - play local .caf file backwards
body: <p>I'm wanting to load a local .caf audio file and reverse the audio (play it backwards).  I've gathered that I basically need to flip an array of buffer data from posts like <a href="https://stackoverflow.com/questions/5379331/audio-manipulation-in-c">this</a></p>
  
  <p>However, I'm not sure how to access this buffer data from a given audio file.  I have a little experience playing sounds back with AVaudioPlayer and ObjectAL(an obj-c openAL library), but I don't know how to access something lower level like this buffer data array.</p>
  
  <p>Could I please get an example of how I would go about getting access to that array?</p>