title: Play Multiple iPod Library Songs On iPhone At The Same Time With Pitch Bending & Other Effects
body: <p>I have been going at this for the past two weeks and it is driving me crazy. I asked this question a couple of days ago (<a href="https://stackoverflow.com/questions/4796643/extract-ipod-library-raw-pcm-samples-and-play-with-sound-effects">Extract iPod Library raw PCM samples and play with sound effects</a>) and whilst the answer got me half way there I am still stuck.</p>
  
  <p>Basically what I am trying to achieve is load up multiple songs from the iPod library for playback with effects such as pitch bend, eq effects etc...</p>
  
  <p>I have gone down the route of AVPlayer and AVAudioPlayer which are too simple. The only framework I've seen that can play audio with these effects is OpenAL. I have tried a few objective c wrappers (Finch and ObjectAL) Finch does not play compressed audio whilst ObjectAL will only convert it for me if I pass in a URL for the file (which is something I cannot do because I only have an incompatible iPod library URL).</p>
  
  <p>An example of an app that does what I want beautifilly is <a href="http://tap.dj" rel="nofollow noreferrer">Tap DJ</a>. It can load up songs from the iPod library fast (unlike <a href="http://amidio.com/touch-dj-2" rel="nofollow noreferrer">TouchDJ</a> and it plays them with all sorts of effects.</p>
  
  <p>Any help would be much appreciated. </p>