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you have two options:

1. in Qtractor, you can assign a MIDI Controller to any plugin parameter (right-click on the intended parameter slider, on the generic plugin properties dialog) or any menu command (see Help/Shortcuts...).
2. specific to all the Vee-One's own GUI, make sure Help/Configure.../Controllers are enabled and after that you can right-click on any knob to get to the local MIDI Controller... dialog.

hth.
cheers