Well, I found a way to use the nanoKontrol: as a mixer in Ableton Live and it works like a charm now!
But to have it working I had to use the Korg editor to set the 2 banks buttons properly because, quite oddly, their default was not to be the 2 banks buttons 
And I also found a way to use my MidiMix to drive the sliders in my Hammond plugin, and that plugin ONLY, so now my set to jam with the Hammond is completed 
Here is the mini-tutorial to explain how