There’s a lot of stuff going on behind the scenes with the Intensity knob.
Waves doesn’t say exactly what is happening, but it’s a combination of EQ, compression, and saturation.
At least that’s what I hear.
The Intensity knob is not linear either.
Some stuff turns ON around 60 and other stuff comes on around 80, so you will need to use your ears.
For most vocals, starting around 40-65 works well.
One thing that makes this plugin so quick to use is the built-in effects.
Since they are already setup for vocals, you don’t need to go through a hundred different settings to get to a starting point.
Just turn on the effect, adjust the level, and you’re done.