Hi Ted and Gilbert,
As I have said so often, I am a relative beginner, but I'll share my approach with you in the hope it may help. Perhaps both of you are already doing what I will suggest.
If I want to play a tune with a full sound like a big band or orchestra, I like to use Techni-Chord with the Orchestrator set to Part 4 so I can have a fourth voice. In the case of a big band I will set reed instruments as the left voice and brass instruments as the voice for Part 4 or vice versa. Since the Techni-Chord harmony will be applied to the Part 4 voice, I may prefer harmony in the reed section for one tune and harmony in the brass section for another. In the case of an orchestra, I often have Symphonic Strings in Part 4, Concert Strings for the Left voice, Bass Ensemble for Right 2 and a lead instrument (trumpet or piano for example) as the Right 1 voice. Then, make your pan, sustain, octave, and volume settings for the various voices.
If I am playing organ, then I usually treat the instrument as an organ and have the traditional upper/lower manual setup. However, if I want organ with a choir backing, I'll put the choir in the Left voice and I'm thinking of a traditional church setting here. An example would be "humming" (from the Sound Explorer group) for the Left voice and "Full Organ" for Right 1 with Techni-Chord set to "Hymn". Balance the volumes and you have a fairly representative church organ/choir sound.
I always use Fingered Chords, hence in the case of a big band or orchestra sound, I have Techni-Chord applying harmony to the Part 4 voice and fingered chords applying harmony to the Left voice. A very full sound results.
I like your suggestion, Ted, that someone offer a list of registrations for us to try. There are thousands of setups possible with the KNs and an experienced player could lead us in the right direction.
You guys take care.
Chuck