midiquestions, I know you’re not asking me, but here’s something to try — there’s a (very) old program called JX-Edit, still works on Windows 7/64-bit (Win XP compatibility mode) and still works great (for me anyway) as a patch editor for a Vecoven JX (except it doesn’t handle most patch factors, just editing for tones). You can get it here (it’s a Wayback Machine link, the page seems to be down but the downloads are still available from Wayback):
https://web.archive.org/web/20141021024646/http://members.iquest.net/~twilight/utils.html
Anyway maybe check if that’ll edit parameters on your JX, works here on mine, very simple to set up.
If you use Reaper, I made a bunch of little JSFX controllers for different parameters (one for filters, one for envelopes, etc), they’re very simple and work great, will upload them to Reaper stash site if you want them.
Also does the Ctrlr panel update when you press a patch button combo on the JX?
