This will only be of interest to a very small minority, but for those of us who have used Core Audio and come across error -66632 in all its glorious undocumented-ness, this is a helpful note.

The error occurs when using AudioQueueEnqueueBuffer. It happens when one tries to enqueue a buffer when the queue in question is no longer running.

Wrap the AudioQueueEnqueueBuffer in a statement that checks to see if the queue is actually running, as in the SpeakHere/SpeakHear (depending on where you look) example. Something like:

if ( [track recording] ) {

  // Re-enqueue this buffer

  status = AudioQueueEnqueueBuffer (inAudioQueue,

                     inBuffer,

                     0,

                     NULL);

  checkStatus(status);

}

..Should do the trick.