Roland PG-1000 linear synthesizer D-50 programmer

via this auction
The seller has one more listed here.

"- 56 Sliders designed to control every parameter of the D-50 or D-550.
- MIDI In, out, and thru connections allowing for real time editing.
- Parameter In input for controlling the D-50 with another keyboard or computer.
- Runs on a 9-volt power supply."





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