Hi Pat
The current Melodyne Assistant has a plugin and standalone - but the plugin does not function with the RB engine.
I found this out on the Celemony forum. So unless PG can make some adjustments, the Melodyne Assistant will only
be available via the Standalone.
Truth be told Pat, I'd use the plugin portion if I could.

By the way, there is a 30 day trial for Melodyne available.
Celemony web page FWIW - Perhaps PG should look into this.
Cheers