prologue

KorgSynths

8- or 16-voice analog polysynth with a Multi-Engine that accepts logue SDK units

The prologue is a polyphonic analog synthesizer made by Korg, sold as a 16-voice, 61-key model and an 8-voice, 49-key model. Each voice has two analog oscillators plus a digital Multi-Engine acting as a third, with noise, VPM and user oscillator types, followed by one filter, two envelopes, one amp and one LFO. It is bi-timbral, so two programs can be played at once, and it has a modulation effect and a delay/reverb effect unit.

Platform

ARM Cortex-M4 (STM32F401)

Manufacturer

korg.com

Community

Related

Top-down view of the Korg prologue analog polysynth — Photo: Korg, manufacturer product image, via korg.com

Notes

Custom firmware images for the prologue are not known. What the community builds are user units made with the logue SDK: custom oscillators for the Multi-Engine and modulation, delay and reverb effects (.prlgunit files, which are zip archives). Korg lists 16 user oscillator slots and 16 user effect slots. Units built with SDK 1.1-0 need system firmware 2.00 or later. They are loaded with Korg's prologue Librarian application or the logue-cli command line tool, and run alongside the stock firmware rather than replacing it. logue-cli can also clear unit data from the instrument. Units built for the prologue, minilogue xd and the original NTS-1 digital kit are binary compatible with each other when the SDK version matches, though Korg encourages builds optimized for each target.

Firmware 21

boochow instruments units

Mixed free and paid logue units from the boochow instruments blog: Alpha One, Pulsaw and Hoovic (paid) plus pay-what-you-want Lily, Pitchy, Vocoder, Delay Lab, minitone and Pure Data packs for several logue devices.

by boochow

ActiveSource: binary onlyproprietary

Distribution: Commercial (paid)

commercial
oscillator
modfx
delfx
revfx
genericfx
synth
mutable-instruments-port
vocoder
pure-data
prologue
minilogue-xd
nts-1
nts-1-mkii
nts-3
drumlogue

boochow instruments units version history
Version	Date	Notes
Vocoder for NTS-1 mkII v1.01	2024-08-27	Adds white noise as a waveform.
Alpha One 1.50	2022-05-28	Better sound quality, with higher processing demands on the NTS-1.

PlaitsXplorer and ElementsXplorer
Plaits and Elements based user oscillators for the prologue that map extra modulation sources and knobs onto the front panel, with a modulation matrix, extra LFOs and key tracking.
by John Walton
ActiveSource: binary onlyunspecified
Distribution
Prebuilt image you flash yourself
- oscillator
- mutable-instruments-port
- plaits
- elements
- modulation
- prologue
PlaitsXplorer and ElementsXplorer version history
Version Date
ElementsXplorer Final 2025-11-10
PlaitsXplorer RC4 2025-08-07

PlaitsXplorer and ElementsXplorer version history
Version	Date
ElementsXplorer Final	2025-11-10
PlaitsXplorer RC4	2025-08-07

Sinevibes KORG units

Sinevibes' commercial unit line for the logue family. 8 oscillators for prologue, minilogue xd and NTS-1, 21 effects for those plus NTS-1 mkII, NTS-3 and microKORG2, and two NTS-3 only effects.

by Sinevibes

ActiveSource: binary onlyproprietary

Distribution: Commercial (paid)

commercial
oscillator
modfx
delfx
revfx
genericfx
reverb
delay
chorus
distortion
prologue
minilogue-xd
nts-1
nts-1-mkii
nts-3
microkorg2

Sinevibes KORG units version history
Version	Date	Notes
Downgrade and Malfunction 1.0.0	2026-08-30	Two new effects for all six supported devices.
Atom 1.0.0 and v2 effect builds	2026-07-17	Effects updated or released for NTS-1 mkII, NTS-3 and microKORG2 alongside the earlier devices.
Cache 1.2.1	2026-07-03	NTS-3 only.

BEAST (Platinum Audiolab)
Paid user oscillator for prologue, minilogue xd and NTS-1 modelled on Minimoog, SEM and ARP synthesizer waveshapes, with a sub oscillator, saturator, pitch and phase warble and 100+ presets.
by Platinum Audiolab
MaintainedSource: binary onlyproprietary
Distribution
Commercial (paid)
- commercial
- oscillator
- virtual-analog
- prologue
- minilogue-xd
- nts-1
BEAST (Platinum Audiolab) version history
Version Date Notes
V1.01 undated Adds the phase control parameter.
freeverb-logue
Port of the public domain Freeverb reverb as a reverb unit for the prologue, minilogue xd, NTS-1, NTS-1 mkII, NTS-3 and drumlogue.
by boochow
MaintainedSource: openMIT
Distribution
Prebuilt image you flash yourself
- revfx
- genericfx
- reverb
- open-source
- prologue
- minilogue-xd
- nts-1
- nts-1-mkii
- nts-3
- drumlogue
freeverb-logue version history
Version Date
v1.2 2025-10-13
v1.1 2024-09-11
v1.0 2021-11-22
FunFM
Two-operator FM oscillator for the prologue, minilogue xd and NTS-1 with alias-suppressed operators, variable waveshape from pulse through sine to saw, bipolar modulation depth and filtered feedback.
by Eugene Chernyh (mrf-r)
MaintainedSource: openGPL-3.0-only
Distribution
Prebuilt image you flash yourself
- oscillator
- fm
- open-source
- prologue
- minilogue-xd
- nts-1
FunFM version history
Version Date
1.2-0 2025-07-05
1.1-0 2024-03-02
1.0-0 2024-02-25
Waves2
Wavetable oscillator that shifts the harmonic distribution of the SDK's 90 built-in waveforms with the Shape knob, for the prologue, minilogue xd, NTS-1 and NTS-1 mkII.
by boochow
MaintainedSource: openMIT
Distribution
Prebuilt image you flash yourself
- oscillator
- wavetable
- harmonics
- open-source
- prologue
- minilogue-xd
- nts-1
- nts-1-mkii
Waves2 version history
Version Date
1.2 2020-08-11
v1.1 2020-07-24
v1.0 2020-07-18
Cain Synthesizers units
Donation-based user oscillators and effects by Pete Kuhn for prologue, minilogue xd and NTS-1, including phase distortion, Karplus-Strong, vowel and shatter oscillators plus two choruses and a rotary speaker effect.
by Pete Kuhn (Cain)
DormantSource: binary onlyproprietary
Distribution
Prebuilt image you flash yourself
- oscillator
- modfx
- phase-distortion
- karplus-strong
- chorus
- vocal
- donationware
- prologue
- minilogue-xd
- nts-1
Cloudlogue Reverb
Port of the Mutable Instruments Clouds reverb to the prologue, minilogue xd and NTS-1 as a reverb effect unit.
by Peter Allwin
DormantSource: openunspecified
Distribution
Prebuilt image you flash yourself
- revfx
- reverb
- mutable-instruments-port
- clouds
- open-source
- prologue
- minilogue-xd
- nts-1
Cloudlogue Reverb version history
Version Date
1.0-0 2020-10-31
DirtBoxSynth logue units
Paid custom oscillators and effects from DirtBoxSynth for prologue, minilogue xd and NTS-1, sold singly or in bundles. The Origami wavefolder oscillator is free for owners who sign up to the newsletter.
by DirtBoxSynth
DormantSource: binary onlyproprietary
Distribution
Commercial (paid)
- commercial
- oscillator
- modfx
- delfx
- wavetable
- distortion
- delay
- prologue
- minilogue-xd
- nts-1
Edouard Digital units (Blinds, JP-Booo)
Two paid user oscillators by Edouard Digital for prologue, minilogue xd and NTS-1. Blinds is an eight-mode wave shaping oscillator with PWM for any waveform; JP-Booo is a Roland JP-8000 style super saw.
by Edouard Digital
DormantSource: binary onlyproprietary
Distribution
Commercial (paid)
Requires stock
prologue and minilogue xd 2.00 or later (including the voice update); NTS-1 1.02 or later
- commercial
- oscillator
- supersaw
- pwm
- wavefolder
- prologue
- minilogue-xd
- nts-1
eurorack-prologue
Ports of Mutable Instruments Plaits macro oscillator models and the Elements modal strike resonator to the Multi-Engine of the prologue, minilogue xd and NTS-1, as separate user oscillators.
by Peter Allwin
DormantSource: openunspecified
Distribution
Prebuilt image you flash yourself
- oscillator
- mutable-instruments-port
- plaits
- elements
- wavetable
- fm
- physical-modeling
- open-source
- prologue
- minilogue-xd
- nts-1
eurorack-prologue version history
Version Date
1.6.1 2020-07-28
1.6 2020-07-27
1.5 2019-11-09
Ghost Time custom oscillators
Seven pay-what-you-want units by Ghost Time Games for the logue family: five oscillators (Clang, Lapse, Sneq, Step, Warped), the Waver mod effect and the Slinky modulated delay.
by Ghost Time Games
DormantSource: binary onlyproprietary
Distribution
Prebuilt image you flash yourself
- oscillator
- modfx
- delfx
- arpeggiator
- drone
- donationware
- prologue
- minilogue-xd
- nts-1

BEAST (Platinum Audiolab) version history
Version	Date	Notes
V1.01	undated	Adds the phase control parameter.

freeverb-logue version history
Version	Date
v1.2	2025-10-13
v1.1	2024-09-11
v1.0	2021-11-22

FunFM version history
Version	Date
1.2-0	2025-07-05
1.1-0	2024-03-02
1.0-0	2024-02-25

Waves2 version history
Version	Date
1.2	2020-08-11
v1.1	2020-07-24
v1.0	2020-07-18

Cloudlogue Reverb version history
Version	Date
1.0-0	2020-10-31

eurorack-prologue version history
Version	Date
1.6.1	2020-07-28
1.6	2020-07-27
1.5	2019-11-09

Hammond Eggs logue plugins

Donation-based collection of about two dozen user oscillators, mod, delay and reverb effects for prologue, minilogue xd and NTS-1 by hammondeggsmusic, from 2019 to early 2021.

by hammondeggsmusic

DormantSource: binary onlyproprietary

Distribution: Prebuilt image you flash yourself

oscillator
modfx
delfx
revfx
reverb
chorus
distortion
looper
donationware
prologue
minilogue-xd
nts-1

Hammond Eggs logue plugins version history
Version	Date	Notes
Cabernet	2021-01-04
Souper 2.0	2020-07-01	Adds two waveforms and smoother glide.
Breathe, Sniff, Cathedral, Theatre, Haze and Mist reverbs	2020-06-21

Junologue Chorus
Juno-60 chorus emulation as a modulation effect for the prologue, minilogue xd and NTS-1, with Speed for the I, I-II and II modes and Depth for dry/wet.
by Peter Allwin
DormantSource: openMIT
Distribution
Prebuilt image you flash yourself
- modfx
- chorus
- emulation
- open-source
- prologue
- minilogue-xd
- nts-1
Junologue Chorus version history
Version Date
1.2-1 2020-10-28
1.2-0 2020-10-27
1.1-0 2020-10-26
1.0-0 2020-10-26
korg-prologue (len)
Early set of prologue user units by len: organ and pluck oscillators and effects including autopan, tremolo, split, and ring and amplitude modulation from the sub timbre, with prebuilt units.
by len
DormantSource: openunspecified
Distribution
Prebuilt image you flash yourself
- oscillator
- modfx
- organ
- pluck
- tremolo
- ring-modulation
- open-source
- prologue
logue-vosim
VOSIM oscillator, after Werner Kaegi's voice simulation system, for the prologue, minilogue xd and NTS-1, with parameters for delay, attenuation, pulse frequency and pulses per period.
by fairplay (Tyrannosaurus)
DormantSource: openBSD-3-Clause
Distribution
Prebuilt image you flash yourself
- oscillator
- vosim
- voice
- open-source
- prologue
- minilogue-xd
- nts-1
Roll-log Sounds units
Custom oscillators and effects by Roll-log Sounds for prologue, minilogue xd and NTS-1, sold or given away as pay-what-you-want packs on Gumroad, plus wavetable and sample import utilities.
by Roll-log Sounds
DormantSource: binary onlyproprietary
Distribution
Prebuilt image you flash yourself
- oscillator
- modfx
- delfx
- wavetable
- fm
- looper
- donationware
- prologue
- minilogue-xd
- nts-1
Sound Mangling user oscillators
Twelve paid user oscillators by Tim Shoebridge for prologue, minilogue xd and NTS-1, covering drum sounds, chords, drones, wavefolding, strings, Karplus-Strong plucks, vector synthesis and waveform morphing.
by Tim Shoebridge
DormantSource: binary onlyproprietary
Distribution
Commercial (paid)
- commercial
- oscillator
- drum-synth
- karplus-strong
- wavefolder
- prologue
- minilogue-xd
- nts-1
Staub (Staub Audio)
Paid user oscillator for the logue family modelled on the rave hoover sound, using a modulated saw plus two further saws an octave apart and a sub oscillator. Sold by Staub Audio for $4.99.
by Staub Audio
DormantSource: binary onlyproprietary
Distribution
Commercial (paid)
- commercial
- oscillator
- hoover
- supersaw
- prologue
- minilogue-xd
- nts-1
Staub (Staub Audio) version history
Version Date Notes
V1.1 undated Four new demo patches; oscillator unchanged.
V1.0 undated
tsoniq logue oscillators
tsoniq's user oscillators for prologue, minilogue xd and NTS-1: fusion and phase7 (free lite and paid pro builds), unity and ds80 (free) and viper (paid wavetable pack).
by tsoniq
DormantSource: binary onlyproprietary
Distribution
Commercial (paid)
- commercial
- oscillator
- wavetable
- supersaw
- virtual-analog
- prologue
- minilogue-xd
- nts-1
tsoniq logue oscillators version history
Version Date Notes
ds80 1.1 2023-12-28 Corrected the Table parameter range and added velocity modulation of the filter EG gain.
ds80 1.0 2023-12-21
viper 2023-12-19

Version	Date
1.2-1	2020-10-28
1.2-0	2020-10-27
1.1-0	2020-10-26
1.0-0	2020-10-26

Version	Date	Notes
V1.1	undated	Four new demo patches; oscillator unchanged.
V1.0	undated

Version	Date	Notes
ds80 1.1	2023-12-28	Corrected the Table parameter range and added velocity modulation of the filter EG gain.
ds80 1.0	2023-12-21
viper	2023-12-19