Controlling Korg MS-20 Legacy efx w/ the MS-20 controller?

I’ve gotten back into using the Korg Legacy collection,especially the MS-20 with the legacy hardware controller. If I load ME-20 as an instrument the controller works fine with it. (BTW system specs are WIN7, 64bit. Cubase 7.06).

The one thing I haven’t figured out is how to get the controller to work with the MS-20, when it is is loaded as an efx insert. I’ve tried the learn function with no luck. In fact the learn function doesn’t respond to any other controller either. Has anyone had any luck using the MS-20 Legacy controller when the MS-20 is used as an efx insert?