title: No mic activity with setLoopBack set to false - AS3
body: <p>Trying to figure out why setloopback needs to be set to true 
  for microphone activity to be detected.</p>
  
  <p>The problem is the echo feedback when using a macbook with a built in mic. </p>
  
  <p>If anyone has some ideas about this let me know.</p>
  
  <p>Right now I'm experimenting with toggling gain, depending on activity to simulate echo reduction. Not optimal though.</p>
  
  <p>@lessfame</p>