INTAL this plug in is easy. It is understood in the plug-in for Wavelab 4 and 5, Cubase SX and Nuendo 2 and 3
I tried it on a G4 mac and a pc in Wavelab.
I deprecated this plugin. It makes it possible to reduce the background noise but there is still a conposante in serious teachers can sometimes be more basic than the noise. In addition there dnature sound by removing much of the signal Aiges depriving its harmonics. The only noise reducer that I enjoyed is SoundHack.