Roland MKS-50 rack-mount version of the Alpha Juno, 1987, made in Japan

Link: vintagesynth | Owner's Manual | Service Manual

SPECIFICATIONS
Polyphony - 6 voices
Oscillators - 1 DCO per voice: Pulse, Sawtooth, Sub, noise waveforms. 1 sub-oscillator.
Effects - portamento, 16 chord memories, transpose, chorus
Memory - 64 User, 64 preset, backup to cassette
Filter - 24db analog lowpass filter
Envelopes - ADSR Envelopes for filter and amp
Arpeg/Seq - None
Keyboard - none
Control - MIDI (w/ velocity and aftertouch mappable to VCF or ENV)
Date Produced - 1987