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Roland JX-3P




roland jx3p synthesizer
roland logo

  audio demo trend price :300-400€
manual demo video comments

ROLAND JX-3P (1983)

Affordable analog polyphonic synthesizer with memory and Midi interface.

PPP : "Programmable, Preset and Polyphonic " Roland advertising.

the italian queen!

multi waveforms

info KEYBOARD (weight: 10 Kg ) 61 keys. Main panel features 38 buttons, 3 sliders and a data entry slider. On the left side there are a pitch bender with a 3-range switch and a button for LFO modulation retrig.

Back panel terminal connectors:
- footswitch sustain input
- clock input for sequencer
- stereo output jacks (3 impedance levels)
- tape interface
- Midi interface


edit VOICE core is a 8-bits CPU Intel 8051 or 8031 manages 6 voices of polyphony.
Each voice is composed by 2 DCO digital controlled oscillators.

filter trimmer

OSCILLATORS the DCOs structures are a bit different:

range 16' 8' 4' 16' 8' 4'
waveforms saw / pulse /square saw / pulse /square /noise
tuning - fine + coarse
cross mod - 2 modes
volume mix balancing DCO1 Vs DCO2 balancing DCO1 Vs DCO2

filter FILTER
based on IC IR3109, VCF is multimode similar to bigger model Juno-60:
- lowpass resonant at -24 dB lowpass
- highpass non-resonant

.filter trimmer

filter trimmer

lfo LFO a single delayed oscillator (square, saw and sample & hold) and 2 destinations:
- DCO pitch
- VCF cutoff with
Modulation can be set to free mode or retriggered pushing the appropriate button

ENVELOPE a single EG model 4-segments ADSR controls 2 sections:
- VCA amplifier with switch betweenEG / gate mode
- VCF filter
Although EG is shared, both VCA and VCF have individual EG polarity inversion.

single stereo analog chorus circuit has some BBD model Panasonic MN3009 and MN3101.

sequencer SEQUENCER
each patterns holds 16 steps (max 128) with some edit facilities like Fill, Note insert (up to six) and Pause step. Definitely very intuitive and really easy to use.

SYNC tempo can be synched to external analog trigger by a +5V pulse signal.

midi MIDI
implementation accepts basic messages like NOTE ON or OFF and systam cannot use both Midi and PG-200 programmer at the same time ... the big rip-off!

memroy MEMORY holds:
- 32 RAM patches
- 32 ROM patches
If you have some troubles storing your sounds, you should check the internal battery (model CR1) which is soldered to the board

MODIFICATION some third part company like ORGANIX produced a new set of hardware OS that expands the original Midi protocol adding a full spectrum of control changes for each parameters plus Midi Sysex handling.

roland jx3p internal


pg200 PG-200 is the dedicated controller. Wired with a custom six pins cable, the parameters data are quick, but not recordable.
mks30 MKS-30 rackmount version - some technical enhancements but it does not sound quite the dreaded 80017A found on Juno-106
custom original scan
custom models gallery
(click to enlarge)


effet VST PLUGIN / SAMPLED VERSION there are some free pack / vst and commercial samples set:

  name price link demo
EFM Oddse Vst Plugin Jv3P free
effet video JX3p vst
audio oddy UVX 3p samples $$ effet  ARP Odyssey

jx3p vst


audio demo and cat mimi

demo 1 - electricity (all jx but drums)
demo 2 - Noise and LFO test
demo 3- internal sequencer
demo 4- demo sent by RWA MUSIC


cloud sound Soudcloud JX-3p

beethoven cloud2 cloud1


JX-3P Sound Demo Adventures with the Roland JX-3P Roland JX-3P and PG-200
Sound Demo Adventures with PG-200

roland jx3p



schematics jx3p


wiseman tips:

The forth hidden LFO waveform "Noise Random" is available only by direct JX3P edit (not by PG) pushing "4"




OS It is reporter that some later OS supports the velocity input parameter, but Jx3p can be updated only by installing EPROMS.

filter trimmer


original scan



original scan


A guy destroys a JX3p

not for the faint-hearted




lfo waveforms vcf filter


- filters
- sequencer


- cannot use Midi and pg200 at same time
- EG


"Good polyphonic for modest budget and Midi is handy! programming is a bit uncomfortable but
sequencer is just great"



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all snapshots*, sounds, texts copyright Polynominal.com / Eric Pochesci
*but "desktop jx3p" "orange juice"- unknown authors.

roland jx3p 4.5 out of 5 based on 31 ratings. price €300