Opsix - Altered FM Synthesizer
Opsix - Altered FM Synthesizer
Opsix - Altered FM Synthesizer
Opsix - Altered FM Synthesizer
Opsix - Altered FM Synthesizer
Opsix - Altered FM Synthesizer
Opsix - Altered FM Synthesizer
Opsix - Altered FM Synthesizer
Opsix - Altered FM Synthesizer
Opsix - Altered FM Synthesizer
Opsix - Altered FM Synthesizer


Opsix - Altered FM Synthesizer

£495.00 Sale Save

Opsix is a digital synth like no other. With a new and accessible approach to sound design, it’s perfect for studio or stage. Dive into fresh, innovative sounds, and explore further with powerful controls at your fingertips. From warm pads and deep basses to icy, sparkling chimes, Opsix unlocks new sonic possibilities and brings unique creative potential to your sound palette.

A vast array of sonic possibilities

Opsix starts with legacy synthesis and quickly evolves into something completely different. New sound components, waveforms, filters, shaping possibilities, effects, LFOs, envelopes, modulations, and more, underpin the Altered FM architecture - delivering sounds with more variety than any single synth has ever been able to achieve before.

Incredible real-time control

Whether you’re tweaking a preset or building a patch from the ground up, data entry knobs give you quick access to the parameters you need. A large OLED display provides a clear overview of your workflow which, combined with the mixer, makes creating new sounds quick, easy and fun

Opsix has a full range of analogue-style filters, including the radical Korg MS-20 low-pass/high-pass filter, and the powerful and smooth Korg PolySix low-pass filter. There are also two- or four-pole low-pass, high-pass, band-pass, and band-reject filters with resonance.

There’s even a spectrum analyser and oscilloscope built in, giving you visual feedback and insight into the music you’re making.

Illuminate your sound

At the heart of every sound is the Operator Mixer – a set of six faders and knobs that invite exploration.

Each of the 6 parts will light up to indicate whether it’s generating a sound, or modulating the sound; red indicates a carrier, blue indicates a modulator.. Changing the position of these controllers unlocks new sound-shaping possibilities to breathe fresh life into your musical ideas.

This simple, powerful hands-on workflow is part of what makes Opsix unique, just like the creative possibilities it offers.

Six-in-one synthesis

Waveforms in Opsix can be arranged and modulated in almost an infinite number of ways, drawing inspiration from numerous types of synthesis.


The most widely used type of synthesis, related to removing parts of a waveform to get the sound you want. Opsix uses up to six envelopes and multi-modelled filters to achieve a broad array of classic and innovative tones.


Rerouting signal paths to change the sound, a spin through the algorithms section can dramatically reshape the base sound while changing how the six mixer parts work together. No patch cables required!

Analogue modelling

Analogue-style controls and plenty of stackable waveforms take you from digital to analogue-sounding in no time. Enjoy deep basses, crisp leads, thick pad sounds, fuzzy brass tones and so much more.

Wave shaping

By adding intentional distortion to the waveforms to achieve aggressive overtones, Opsix makes it possible to achieve gritty sounds overflowing with character.


With six operators, the complete FM experience is possible with Opsix. Stacking waveforms and blending their harmonics is key to an expansive range of harmonious, dissonant, and tension-driven sounds. Head back in time and experience classic sounds heard throughout recording history.

Classic FM

Opsix’s flexible and powerful architecture starts with true six operator FM synthesis. It easily delivers signature sounds heard on thousands of hits from the ‘80s through to today. Opsix also benefits from far more polyphony than other standalone FM synths available today.

Powerful effects processing

Opsix has thirty high-definition effects that can be layered. Elevate your sound to the next level with options like chorus, phaser, delay and compressor, alongside world-class shimmering reverbs.

Polyphonic motion sequencing

Opsix features an incredible step sequencer. Create your own sequences, or simply press the play button for each sound to experience the depth of sequence possibilities.

Six notes per step can be recorded, with control over each note's velocity, gate time, and playback timing. Create long phrases or even make subtle shifts in timing to emulate strums or drum rolls – often not possible on typical 16-step sequencers!

The motion sequencer in Opsix also lets you record changes of up to six parameters, creating smooth motion within a phrase, or building rhythms that change dramatically with each step.

Intuitive modulation matrix

With six operator modes and 40 preset algorithms, plus the ability to create your own, the modulation possibilities available within Opsix are mind-blowing.

The synthesis is supercharged with processors at the end of the signal chain. A MOD section works separately from the operators, with three EGs and three LFOs; and 12 virtual patches for a wide variety of routing possibilities. These features provide a vast range of modulation to both create swirling soundscapes and add rhythmic motion to your sounds.

Throw the dice with true randomisation

Use the randomize feature if you’re in the mood for unexpected sonic discoveries. Press the dice button to completely scramble the synth’s parameters, generating a new, unique sound. You can choose to randomise all parameters, or just operators, algorithms or sequences.

You might strike gold with your roll, but if not, just try again or use the result as a starting point for your next new sound!

Free librarian software

The Opsix sound librarian lets you view and organise data when the Opsix is connected to computer via USB.




Version 2

Download Opsix V2


Version 2

37 keys (velocity and release-velocity sensitive)
Sound generating system
Altered FM sound generator
Maximum Polyphony
32 voices (or a max. of 24 voices, depending on the settings)
6 operators, 1 filter, 3 EGs, 3 LFOs, 3 effects, step sequencer, arpeggiator
40 presets + user algorithm (unique to each program)
6 modes (FM, Ring Mod., Filter, Filter FM, Wave Folder, Effect *v2)
Oscillator waveform
23 waveforms (Sine, Sine 12bit, Sine 8bit, Triangle, Saw, Saw HD, Square, Square HD, Additive Saw3, Additive Sqr3, Additive Tri3, Additive 12345, Additive 1+2, Additive 1+3, Additive 1+4, Additive 1+5, Additive 1+6, Additive 1+7, Additive 1+8, Noise S/H, Noise White, Pink Noise, Blue Noise) (*Pink and Blue noise added in V2)
11 types (LPF 12, LPF 24, LPF MS-20, LPF POLY6, HPF 12, HPF 24, HPF MS-20, BPF 6, BPF 12, BRF 6, BRF 12)
23 waveforms (Triangle, Saw Down, Saw Up, Square, Sine, Sample&Hold, Guitar, Exp. Triangle, Exp. Saw Down, Exp. Saw Up, Step4 Triangle, Step6 Triangle, Step4 Saw Down, Step6 Saw Down, StepRnd:Time, StepRnd:Lvl&Time, StepRnd:Level, Random:Time, Random:Lvl&Time, Triangle + , Saw Down + , Saw Up + , Square +)
12 routings
30 types (Chorus, Unison Ensemble, Phaser, Phaser (BPM) , Auto Pan, Auto Pan (BPM), Flanger, Flanger (BPM) , Rotary Speaker, Auto Wah, Exciter, Enhancer, LFO Filter, 3-Band EQ, Distortion, Guitar Amp, Decimator, Grain Shifter, Master Limiter, Compressor, Delay, Delay (BPM) , Autopan Dly, Autopan Dly (BPM), Tape Echo, Tape Echo (BPM) , Early Reflection, Reverb, Shimmer Reverb, Spring Reverb)
Step Sequencer (up to 16 steps, up to 6 notes per step)
Motion Sequencer (up to 6 lanes)
7 patterns (MANUAL, UP, DOWN, ALT1, ALT2, RANDOM, TRIGGER) fault)
Number of programs
500 (250 preset programs and 250 user programs as the factory-set de
64 (16 Slots × 4 Banks)
MODULATION wheel, PITCH wheel, RATIO OP 1–6 knobs, LEVEL OP 1–6 sliders, DATA ENTRY A–F knobs
Headphone (6.3 mm stereo phone jack)
OUTPUT L/MONO and R (impedance-balanced 6.3 mm TRS phone jacks)
DAMPER (6.3 mm phone jack, half-damper not supported)
MIDI IN and OUT connectors
USB B port
Power supply
AC adapter (DC12V)
Power consumption
5 W
Dimensions (W × D × H)
565 × 338 × 90 mm / 22.24" × 13.31" × 3.54"
2.9 kg / 6.93 lbs
Included items
AC adapter
Accessories (sold separately)
DS-1H damper pedal, PS-1 pedal switch, PS-3 pedal switch
* All product, company, and standard names are trademarks or registered trademarks of their respective holders.
* Appearance and specifications of products are subject to change without notice.


All new products are sold with a 3-year manufacturer warranty when bought direct from Korg UK.
Certified Refurbished products also come with a warranty, for more information find out more about our certified refurbished products.


We offer a 30-day returns period on all products purchased directly from Korg UK. More details can be found in our return policy.