The #JX3P is the reason why I taught myself C again, because #MIDI #sysex hadn't been invented yet, so the only way to save/restore patch parameters was to dump to audio tape. SO I WROTE A PROGRAM TO DECODE THE TAPE DUMPS and create spreadsheets to feed back into the #Organix MIDI expander!
https://www.phaysis.com/projects/roland-jx-3p-tape-dump-patch-decoder/