Remote Control of Quick Controls

Cubase 5 - I have the rotary plug-in on an audio track and am attempting to use the Quick Control to switch the speed (Leslie style) with a midi controller (Axiom). I do all the assignments - Quick Control on track assigned to Rotary Speed - Device Setup - Remote Devices - Quick Control 1 assigned to my chosen knob (the Learn function finds it). But the Quick Control doesn’t respond. Is there something I’m missing?