Roland Jupiter 4, 1978-1979, made in Japan

Specifications vintagesynth
Polyphony - 4 voices
Oscillators - 1 VCO per voice (triangle, square, square with PWM) and a switchable on\off sub osc
LFO - 1 LFO (sine, square, ramp up and ramp down)
Filter - HP filter, LP rez filter
VCA - 2 env (ADSR) one for the filter which you can invert, one for the VCA
Effects - Ensemble/Chorus
Arpeg/Seq - Arpeggiator
Keyboard - 49 keys
Memory - None
Control - TRIG IN to control the arpeggiator
Date Produced - 1978/79

MIDI retrofit for Jupiter 4