title: How can I lower the volume of iPod audio while my app plays a sound
body: <p>I'm trying to reproduce the functionality of built-in Mail application when a new message arrives while you are listening to iPod music.</p>
  
  <p>What happens with the Mail app is:</p>
  
  <ol>
  <li>iPod's volume lowers a bit</li>
  <li>Mail app plays a short sound and vibration</li>
  <li>iPod's volume goes back to normal</li>
  </ol>
  
  <p>I know how to play a sound and cause vibration, what I don't know is how to lower iPod's volume and restore it after my sound plays.</p>
  
  <p>How can I reproduce this same functionality in my app with SDK 2.2? I know third party apps can't run in the background. My users will play the iPod then have my app in the foreground. </p>