xk-3 compatibility? Not so Much!

I was very excited when saw that the b-4II included the xk-3 compatibility, and this was the biggest reason I purchased the upgrade. However, the Leslie fast/slow switch on the xk-3 does nothing. If I try the midi learn function, it will only switch to low speed provided I manually switch to high with the mouse 1st.
The same result happens when using it with a pedal ( i have a pedal setup to switch the speed on the xk-3 which works fine for the xk-3, and has been a standard way of additional switching since b-3 clones came out in the 80s).

It is listed as CC99 when I use the midi learn.

I found that I can make it work with the mod wheel. The problem is that I've used b-3 clones for so long (I've had a Viscount organ, a Roland VK-7, and the Hammond Xk-2 and now xk-3) that I reach for the switch instead of the mod wheel.

Please NI, can you look into this so the software is trully xk-3 compatible?