Jupiter-4

Roland Jupiter-4

Released: 1979

MSRP: no

Synopsis:

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.

Physical

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

Interface

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

Architecture

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

Output

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

Control

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

Keyboard

Key Pressure	Chord Memory	External Control	External Sustain	Key Scaling	Velocity Curves
HASH(0x5c8c9b0)	no	no	pedal	routed to VCF	no

Source

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

Filter

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

Envelope

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

LFO

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

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