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Roland Jupiter-4

Jupiter-4 (image courtesy of Roland)

Released: 1979

MSRP: no


As with the JX line the first model of the line is a bit of an anomoly, performing more like a Juno than a Jupiter. Architecture Class: Conventional (subtractive).

Ebay Description:

The Roland Jupiter-4 Compuphonic (JP-4) is a 49 key, 4 voice polyphonic analog synthesizer, featuring a single oscillator (saw/square/pulse waveforms with PWM and sub-oscillator), noise, high-pass and resonant low-pass filters, dedicated filter and amp ADSR envelopes, LFO (saw/squre/triangle), portamento, S/H (to filter), arpeggiator, chorus, 18 presets (8 editable), and arpeggiator.


Form Factor Dimensions Weight Audio Input Audio Output Communication Port Control Input Control Output Switch Input Power
49 keys W:946mm D:410mm H:179mm 19kg no stereo no pedal:filter pedal:volume clock:arpeggio no sustain 30W AC


Compatibility Multitimbral Memory Program Memory External Storage External Programming UI Input UI Output
no no preset:10 user:8 no no knobs/sliders LED


Multitimbral Polyphony Unison Architecture
no 4 2 modes VCO->HPF->VCF->VCA


Effects Pan Modulator Volume Modulator Headphone
chorus no EG LFO pedal yes


Arpeggiator Arpeggiator External Sequencer Sequencer Memory Sequencer External Continuous Program Change
up and or down or random clock No N/A N/A pedal bend-lever mod-lever no


Key Pressure Chord Memory External Control External Sustain Key Scaling Velocity Curves
HASH(0x3dd3e38) no no pedal routed to VCF no


Name Signal Class Waveform Octave Range Amplitude Modulator Harmonics Modulator Pitch Modulator Wave Assign Modulator
VCO analog saw square pulse 4-16' no PWM:LFO LFO bend-lever portamento no
SUB analog square - no no no no
Noise analog noise - no no no no


Name Signal Class IC Resonant Shape Frequency Modulator Resonance Modulator Shape Modulator
HPF analog opamp no high pass no no no
VCF analog IR3109 yes low pass EG key LFO S/H pedal no no


Name Level Rate Loop Polarity Trigger Level Modulator Rate Modulator
VCF-EG sustain attack decay release no yes key no no
VCA-EG sustain attack decay release no no key no no


Name Waveform Delay Polarity Sync Delay Modulator Level Modulator Rate Modulator
LFO saw:up saw:down square triangle no no no no mod-lever no
S/H random no no no no no no
Conventional Models
RS-101 RS-202 RS-505 RS-09 SA-09 VP-330 SH-3 SH-5
SH-1000 SH-2000 SH-7 SH-1 SH-2 SH-09 SH-101 MC-202
CMU-810 TB-303 CMU-800 Juno-6 Juno-60 MKS-10 Juno-106 Juno-106s
HS-60 MKS-7 Juno-1 HS-10 Juno-2 HS-80 MKS-50 Jupiter-4
MRS-2 Jupiter-8 Jupiter-6 MKS-80 JX-3P MKS-30 GR-700 JX-8P
JX-10 MKS-70