title: How to access the second mic android such as Galaxy 3
body: <p>A lot of smart phone now have more than one microphone. One for voice input and another for reducing the enviroment noise. </p>
  
  <p>I am wondering how could I access the two microphone's signal independently? Or turn off one of the microphone? </p>
  
  <p>Any thoughts or comments are welcomed. Thanks a lot.</p>