Roland JX-3P 1983 w/ Series Circuits MIDI Upgrade

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via this eBay listing

"Roland JX-3P 1983 Synthesizer with Series Circuits MIDI Upgrade

The famous JX-3P synth!

The serial number dates this model to November of 1983.

This unit has been upgraded with the Series Circuits JX-3P MIDI Upgrade Kit

The JX-3P MIDI Upgrade Kit adds the following new features to your Roland JX-3P:

Simultaneous use of the PG-200 or DT-200 and MIDI input
Real-time control over all JX-3P parameters with standard MIDI CC messages
Loading new patches into the JX-3P via MIDI (CC)
Selectable MIDI receive channel (1-3)
Velocity sensitivity (via MIDI-input, not the keyboard)
Additional features for owners of a PG-200 (or DT-200) programmer:

Transmission of MIDI CC messages from the programmer to record in
a sequencer or DAW for automation, and/or to control other MIDI devices
Saving JX-3P patches as MIDI files onto your computer
The keyboard was just serviced (March 2026) by Jan of Solder & Sound at Main Drag Music in Brooklyn, NYC. During the servicing the memory battery was replaced, along with 2 ICs, 1 resistor, 1 pot, and 1 cap.

This keyboard is used and shows signs of it including nicks, dings, dents, scrapes, scratches, rust, dirt, grime, bumps, and bruises, but is in otherwise great shape. The sheet music/pencil holder clips in and out easily and will be taped down for shipping. There is some sort of clear plastic like substance in the middle of the edit map diagram but it is small and has no effect on the unit. The back of the unit has an outward dent and a small crack in the base."