via this auction
"Up for sale is a KORG Mono/Poly MP-4 vintage analog synthesizer with a Midi retrofit from CHD Elektroservis. It is in overall very good condition. It is a classic synth, with both mono and polyphonic modes. It has four oscillators that can either be stacked in unison, used in polyphonic mode, or a combination of the two. It also has an excellent arepggiator (you can set the oscillators independantly and have the arpggiator run through Osc 1-4 sequentially, a different wave form or octave on each), great fx routing. As far as I can tell it is totally functional. I went through every key, knob, switch, effect, and modulation, and midi control as well.
Cosmetically I would rate 8 out of 10. There is minor wear and marks on the body and some chipping to the wood ends, but overall it is in very good condition. See pictures below.
MP-KBD MIDI retrofit enables your Korg Mono / Poly to be controlled via MIDI. You can remotely control the keyboard and speed of the arpeggiator by MIDI commands. The instrument then works like MIDI sound expander. All working modes of the instrument and controllers on instrument's panel stay fully workable with installed interface.Features:
The interface controls up to four keys simltaneously so the instrument can work in both Mono and Poly modes.
Instrument's keyboard can be controlled manually and by MIDI Note On/Off commands simultaneously.
The keyboard can be transposed in whole range of MIDI notes.
Four modes of key priority can be chosen: Last / Higher / Lower / None.
Tone generators can be tuned by MIDI Pitch Wheel command. The bend range is from 0 to ±2 octaves.
Arpeggiator can be synchronized with original internal tempo generator or external MIDI clock.
Number of MIDI channel for communication is user programmable. OMNI mode can be chosen, alternatively.
Default values of all parameters are user programmable - they can be stored into internal memory.
MIDI implementation - reception only:
Note On / Off
CC 16 - Key Shift parameter setting
CC 17 - Key Priority parameter setting
CC 18 - Pitch Wheel Range parameter setting
CC 19 - Arpg Clock Rate parameter setting
CC 64 - Hold
CC 120 - ASO
CC 121 - RAC
CC 123 - ANO
Pitch Wheel
System Clock
System Exclusive - setting and programming of all parameters, selection of MIDI channel"
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