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/

Roland JX-3P Tape Dump Patch Decoder – Phaysis

Because I've done work to this girl. She has the #Organix MIDI-CC custom module that allows setting patch params via MIDI-CC messages. I built that from kit and modded the synth. That's worth AT LEAST $200 over price, parts and labor notwithstanding. I know my shit.