title: Core Audio - CARingBuffer to read an audio file for callback
body: <p>Does anyone have a good example of using CARingBuffer to buffer a large audio file and how to read it in a callback?</p>
  
  <p>Should it be reading the audio file in a secondary thread? How do I pause loading the audio file until the loaded buffers have been played (how do I pre-queue the audio file)? CAPlayThrough seems close but is only streaming audio from a microphone.</p>
  
  <p>Thanks!</p>