http://midipolis.blogspot.com/p/manuals.html
"Io User Manual
1. Introduction
Io is a MIDI retrofit system for the Roland Jupiter 4 synthesizer. It consists of two boards that can be used either parallel or individually.
One of the boards is the Keyboard Assigner Extension and it enables MIDI control over pitch note, pitch bend, cutoff frequency, volume and portamento. It also synchronizes the arpeggio to MIDI clock and has two powerful LFOs on pitch bend and cutoff frequency. LFO settings are storable and recallable.
The other board is a complete replacement of the Jupiter's original patch programmer microprocessor with full MIDI specification and lots of functional enhancements.
2. Operation of the Patch Programmer










































