Well, thanks to help here, I have been enjoying my new toy. The physical layout is good, it performs well. Seat height is in need of improvement. Now I have to get used to thinking and playing like an organist again! If you want to find out how good your keyboard fingering is, play an organ for a few minutes. That should show up the flaws! Fortunately, I have a long background in organ work, so the technique is returning quickly.
I am now looking for a way to use GPO organ and a sound font simultaneously, but so far, no luck. GPO organ and JV-1010 work well. Ideally, I would use GPO organ and GPO organ, but that seems impossible. So I will concentrate on the sound font problem. I can get them playing with independent voices (GPO and SF2) but the SF2 sounds appear with the GPO sounds, but not vice versa.
I don't know why I did not do this before! Around the end of the year, I will look in to getting a pedal clavier.