So a value of 64 in the Velocity Depth and Velocity Offset means neutral. Great, this eliminates the velocity limit reason. I moved the effect and the Sweep sliders, and none affected the VST sound. So, as you said it could be the VST responded strangely to some midi CC from the host. At this point what I heard seems to be a velocity curve change. I'm glad there is no rerouting of the VST audio back to the host as I question in the beginning. I will use the product more and update if I found something. The level of interaction (controls) with a VST plugin is impressive. Thank you for your help.