Manage vibrato in VariAudio like with Shaper Tool in Repitch

like this:

Or do we already have an other way to do this…?

You can also take a look at the vocal generators like Ace Studio, Synth V and - last but not least because it also has a connection with Yamaha, just like Steinberg/Cubase: Vocaloid. So such a technical solution should not be far away. Should it?