title: Audiokit 4.5 playgrounds opening, building, but no sound
body: <p>In the past I've got previous versions of the playgrounds to work. However I can't get the new 2 day old version (4.5.0) from GitHub to work.</p>
  
  <p>I downloaded the zip file from <a href="https://audiokit.io/downloads/" rel="nofollow noreferrer">https://audiokit.io/downloads/</a> page.
  I expanded the zip. 
  I launched Xcode by clicking on the AudioKitPlaygrounds.xcodeproj file.
  I go to the Hello World tutorial.
  I click on run button and it builds successful.
  No errors, nothing in console, no yellow or red build or runtime errors - but no sound. Also no sound in the handful of other playgrounds I spot tested.</p>
  
  <p>I search on the internet - and found an answer saying to add this setting, but it had no effect.
  AKSettings.playbackWhileMuted = true</p>
  
  <p>The volume is definitely on. I have got the ROMPlayer working as a separate project using cocoa pods. But not the playgrounds. Any help much appreciated. Thanks Domc</p>