title: Recording audio from multiple microphones simultaneously with getUserMedia()
body: <p>it is possible to access different microphones at the same time using <code>getUserMedia()</code>?</p>
  
  <p>This whould be useful to </p>
  
  <ul>
  <li>filter out background noise;</li>
  <li>create some sort of stereoscopic effect;</li>
  <li>make available multiple audio tracks for an international 
  streaming conference.</li>
  </ul>
  
  <p>Apparently, it is quite tricky for video source:
  <a href="https://stackoverflow.com/questions/21182518/capture-video-from-several-webcams-with-getusermedia">Capture video from several webcams with getUserMedia</a></p>
  
  <p>I was wondering if, for the audio source, the problem was different.</p>