title: how to change frequency ( pitch) and the amplitude in wave file using c#
body: <p>how to change frequency (pitch) and the amplitude in wave file using c# like this but on wave file not tone 
  <a href="http://www.youtube.com/watch?v=Tumpkl-xJuA" rel="nofollow">http://www.youtube.com/watch?v=Tumpkl-xJuA</a></p>