So far no success.  Here is more info about the status of my FF400:
The MIDI light on the front of my FF400 for In 2 is blinking regardless if I am playing the organ or not, while In 1 is a solid light.
While playing the organ,
there is no indication on the transport of Cubase that any MIDI data is being received.
And there is no indication of MIDI out being transmitted.

One thing I noticed when opening up the FF settings is that each of the tabs had a suffix of 1, eg Fireface (1), Analog (1), LTC (1).
Might this indicate something else I need to do with the FF400?

Hi Jeff,
Yep, MIDI 1 is working just fine, recognizing input from both my Korg TS and my XS-Rack.
And Cubase recognizes the MIDI 2 port because it shows it in the list of outputs.
Cubase has a process call MIDI Device Manager with a list of popular keyboards to define presets but there are no Hammond listings.
There is another process called Input Transformer which I am in contact with the Cubase forums about.
thx,
ciao, Dan