NI B4D with Halion 6?

The Halion 6 is such a great Hammond and Leslie simulator that I want to use my old Native Instruments B4D Controller with it. I’m using Halion as a plugin. Although I can get Halion to recognize the MIDI output from the B4D, I can’t get it to respond to any movement from the B4D, and definitely can’t program it to the Macro controls of the Halion Model C. Any ideas?