I am also waiting with bated breath.
I use the CodeKnobs with my Pro6 for every project.
I bought the Soundtower Plugin for the Pro 3 and its terrible and unusable. Utter waste of money. Don't do it.
I haven't used the VST plugin yet... so not sure about that. I do use the Editor program though.
The earlier version(s) of the SoundTower Pro 3 editor had some bugs.
If you have the Editor, try downloading the latest version (1.1.1)
https://www.soundtower.com/pro3/index.htmlThere are still some known issues with the sequencer in editor, but I believe they are working on that.
If you find bugs, send them a message at support@soundtower.com - If you can detail the reproducible steps for your issue, they are pretty good about making fixes. I sent them detailed bug reports over the past couple months and they have worked through the issues I found.