title: What does each sample in kAudioFormatLinearPCM represent?
body: <p>I figured out that the default setting on my device for audio is kAudioFormatLinearPCM.</p>
  
  <p>I get 4 bytes per sample in mData in the AudioBuffer.  </p>
  
  <p>Is each value an absolute amplitude value?  Is it always a positive number?</p>