INSTALLING THE RIVER MIDI EXPANSION KIT ON A ROLAND JX-3P

This is a really nice kit, sadly now discontinued. The Organix kit seems to be very similar although equally hard to find it seems

The River kit allows control of parameters via MIDI CC
Use of the Programmer and MIDI
3 distinct MIDI channels

Video for reference only

Видео INSTALLING THE RIVER MIDI EXPANSION KIT ON A ROLAND JX-3P канала Mindburner