Promidi -- Thank you very much for taking your time to look at this. You are correct: Turning the Velocity knob in the AmpliTube Envelope cluster to the right increases the synth's sensitivity to velocity. (Turning it to the left appears to invert it's velocity sensitivity.
) I'm just learning about synths, so this was very helpful. Not only did you solve my problem, but you also gave me some insights on how to research these problems myself in the future.
Thanks again!!