title: errors building AudioKit Cookbook with v5 beta
body: <p>I'm trying to build <a href="https://github.com/AudioKit/Cookbook" rel="nofollow noreferrer">AudioKit Cookbook</a> with XCode Version 12.0.1 (12A7300), and I get these errors:</p>
  <pre><code>/Users/ali/Documents/Development/Cookbook/Cookbook/Cookbook/Recipes/Shaker.swift:13:30: Value of type 'CallbackLoop' has no member 'start'
  /Users/ali/Documents/Development/Cookbook/Cookbook/Cookbook/Recipes/Shaker.swift:13:45: Value of type 'CallbackLoop' has no member 'stop'
  /Users/ali/Documents/Development/Cookbook/Cookbook/Cookbook/Recipes/Shaker.swift:40:14: Value of type 'CallbackLoop' has no member 'stop'
  /Users/ali/Documents/Development/Cookbook/Cookbook/Cookbook/Recipes/DrippingSounds.swift:28:37: Value of type 'CallbackLoop' has no member 'frequency'
  /Users/ali/Documents/Development/Cookbook/Cookbook/Cookbook/Recipes/DrippingSounds.swift:45:19: Value of type 'CallbackLoop' has no member 'start'
  /Users/ali/Documents/Development/Cookbook/Cookbook/Cookbook/Recipes/DrippingSounds.swift:53:15: Value of type 'CallbackLoop' has no member 'stop'
  /Users/ali/Documents/Development/Cookbook/Cookbook/Cookbook/Recipes/DrumSynthesizers.swift:15:30: Value of type 'CallbackLoop' has no member 'start'
  /Users/ali/Documents/Development/Cookbook/Cookbook/Cookbook/Recipes/DrumSynthesizers.swift:15:45: Value of type 'CallbackLoop' has no member 'stop'
  /Users/ali/Documents/Development/Cookbook/Cookbook/Cookbook/Recipes/DrumSynthesizers.swift:55:14: Value of type 'CallbackLoop' has no member 'stop'
  /Users/ali/Documents/Development/Cookbook/Cookbook/Cookbook/Recipes/Flute.swift:13:30: Value of type 'CallbackLoop' has no member 'start'
  /Users/ali/Documents/Development/Cookbook/Cookbook/Cookbook/Recipes/Flute.swift:13:45: Value of type 'CallbackLoop' has no member 'stop'
  /Users/ali/Documents/Development/Cookbook/Cookbook/Cookbook/Recipes/Flute.swift:43:14: Value of type 'CallbackLoop' has no member 'stop'
  </code></pre>