Measuring Sound

I've seen many source code examples of implementing a VU, or Graphic equalizer into an audio application. These VUs and EQs can measure any sound source that uses a wave mapper. Windows uses a wave mapper for its system sound effects. Windows Media Player doesn‘t, but the popular program Win Amp does. How would I implement a wave mapper into my API driven MP3 Player? I've already got a working Graphic equalizer, it measures system sounds, and it even kicks in when I open WinAmp. I just need it to recognize the sound stream from MY program.

I replied to this in one of the other forums...try the General forum :)