Roland JD-990

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JD-990 Super JD
Roland JD-990 front.png
Technical specifications
Polyphony24 voices
Timbrality6 + 1 Drum part
Oscillator6MB of PCM ROM with 195 waveforms (expandable to 16MB), 4 waveforms (tones) per patch
LFO2 per patch
Synthesis typeDigital Sample-based Subtractive
FilterTVF (Time Variant Filter): Lowpass/bandpass/highpass-filters with resonance
AttenuatorTVA envelopes, TVF envelopes and pitch envelopes
Aftertouch expressionYes
Velocity expressionYes
Storage memory3 banks of 64 patches (expandable), 3 drum kits with 61 sounds
EffectsChorus, Reverb, Delay, Phaser, Spectrum, Enhancer, Distortion and EQ
External controlMIDI

The Roland JD-990 Super JD is a module version of Roland JD-800 synthesizer with expanded capabilities, which was released in 1993. JD-990 is a multitimbral synthesizer utilizing 'wave-table' sample-based synthesis technology. It is equipped with 6 MB of ROM containing wavetables, four sets of stereo outputs that are assignable to individual, internal, instruments, and standard MIDI in/out/through ports. JD-990 has a large LCD display[1] and programming takes place through a keypad on the front panel of the unit. The unit can generate multi-timbral sounds reminiscent of the vintage analogue synthesizers but is also capable of generation of modern digital textures. There are several expansion boards available for JD-990 that can be installed in the provided expansion slot in the chassis of the unit.


The JD-990 had the following features which were not available on the JD-800:

  1. Expanded wave ROM (6 MB vs. 3 MB)
  2. Ability to use an 8 MB expansion board from the SR-JV80 series
  3. JV-80 patch import
  4. 4 additional outputs
  5. True stereo engine
  6. Individual panning of each tone in a patch
  7. Oscillator sync
  8. Frequency cross-modulation (FXM)
  9. Matrix Modulation
  10. Modulation of the same destination from multiple sources
  11. Oscillator structures that allow ring modulation and serial dual filters
  12. Additional LFO waveforms: sine, trapezoid and chaos
  13. MIDI CC control of parameters
  14. Tempo sync delay
  15. Polyphonic portamento
  16. Analog Feel. Adds a very subtle pitch modulation to the basic waveforms intended to recreate an analogue synth's 'drift'
  17. Performance memories
  18. Additional multitimbral slots
  19. One patch can keep full effects in multi mode

Factory Sounds[edit]

The Factory presets of the JD-990 were created by Eric Persing and Adrian Scott.


  1. ^ "The History Of Roland: Part 4". Retrieved 2018-07-17.

External links[edit]