Jerry,
It works just fine for auto-leveling...
Waves plugins require VST 3 support for their Side Chain abilities.
With the Side Chain feature you can:
With a few programs (Pro Tools, Nuendo, Cubase, and Studio One), you can even feed a mix of the music into Vocal Rider’s sidechain. This insures that the vocal is not only consistent with itself, but can change if the music changes— louder during loud parts, neutral (no boost) during softer passages.
If you create a buss for the mix, then feed that mix buss to the Side Chain of the Vocal Rider, it will
insure that the Vocal "stays out front" based on the mix content...so to speak...
Hope that helps!