title: LibGDX Sounds Issue
body: <p>I am developing a game for Android and the Desktop with LibGDX.  I am having a problem with playing sounds.  The game is a labyrinth style game, there are balls that roll around on the device using the accelerometer.  When balls hit the border, or one another a sound is played.  The volume is set based on the linear velocity of the collision.  The problem is, when the balls get really close to the border, they bounce many times in a small period of time.  This ends up bogging down the main thread, and the UI starts to stutter.  In log-cat it says "reducing sample rate" or something like that, because it can't handle the load.  Also, when there are a bunch of collisions, the sounds keep playing after there aren't anymore collisions.  </p>
  
  <p>I need each of the sounds to be played independently of the other sounds.  I was thinking, maybe creating a separate thread for the sounds.  Any help would be greatly appreciated.</p>