Awhile back I released some patches for JX8p. It was a bulk sysex file. Well JX8p doesn't use bulk sysex. It saves each file individually if you aren't using a memory cartridge.
Here is the correct file for all the JX8p Patches: http://www.chipcollection.com/JX8PSoundsroland.zip
Instructions: Open with Sysex Librarian or other program. Set your JX8p to midi Channel 6!!!!