title: sound capture using c# issue
body: <p>I have developed a sound capturing winform application using NAudio 1.3
   on c#. The idea is to capture streaming songs through sound card. It is
  working perfectly fine on windows xp.
  But On vista and windows7 machine if there is no sound driver installed  it also take mic voice with it
  which is a big issue(i have checked it on dell laptop and if i mute the microphone than it does not capture any sound
   )i just want  to capture streaming song sound .NAudio 1.3 uses WASAPI audio capture for windows vista and 7.I need to solve this
  issue urgently.</p>