Lawrence, I'm sure I'm not the only one who's silently following this thread. I want to say you are doing an admirable job in following this through and you're very good at describing both the problems you're having and detailing exactly what you're doing and then kudo's to Andrew for his detailed information as well.
Your comment "Could the originators of this system have made this any more confusing?" is right on brother. I have the newer Roland Sonic Cell and I think I've made a bit more progress with it than you have with your JV but I'm no expert at this by any means. I just built a new PC and I have a complex EMU 1820M system with Emulator X plus a bunch of softsynths. I was going to install all that last weekend but decided I was going to learn all I can about getting the most out of my Sonic Cell first and I'm having similar problems you are in figuring this all out. I keep going back to why I decided to keep everything GM just because who has time to sort all this other MSB, LSB, different systems for program changes etc, etc out? It's just ridiculous sometimes. I see people continually posting a version of this: I don't want to be a #^&$&* computer programmer, I just want to make some music! Well no problem if you keep it all GM but you want to go further, you're into technogeek land and that has nothing to do with music. That little weird thing in the midi monitor you discovered for example. I gave up on that thing several years ago. You're trying to do something musical and you wind up wasting a whole afternoon tracking down something like this. That thing with the help file I noticed that too but I'm not blaming PG, every program I've ever used has stuff like that in them. That's just the name of the game with music programs.
Anyway, I've already learned a lot from this thread I for one want to encourage you to keep it up and keep posting your results here. You're doing a great job and you're showing way more patience than I have trying to figure all this out.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.