title: How to make swoosh graphic/sound effect?
body: <p>I have a UIImageView that can be dragged around with a finger.  It is sized to an image in it, such as a ball or square.  If the user accelerates very quicker, I'd like to trail the object with a blur of itself to give the appearance of going fast.  Like what happens with warp speed.   I also have a swoosh sound.  I'd like the sound to last only as long as the user is accelerating.</p>
  
  <p>How can I accomplish these effects?</p>