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Korg Opsix Altered FM Synthesiser
Product #81736 | SKU OPSIX
Availability on Request
5.0 (based on 1 rating) Thanks for your rating!

Korg Opsix Altered FM Synthesiser

Product #81736 | SKU OPSIX
Availability on Request

Product Features
  • True 6-operator FM synthesis, and more
  • Makes FM exploration easier than ever
  • Maximum polyphony: 32 voices
  • Easy-to-use 6-fader operator mixer
  • Full editing with the Data Entry rotary encoders
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Product Details
  • Product: #81736
Our Price $1,139.00
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The Korg Opsix Altered FM Synthesiser is an altered digital FM synthesiser that features a true 6-operator sound generator with a diversity of waveforms and operator modes that goes far beyond the realm of standard FM, making it well suited for sound designers, producers, and musicians. The opsix offers the editing simplicity of analogue synthesis to control the power of the FM engine.

There are six sets of knobs and sliders on the opsix panel, each with two-coloured LEDs, which help you quickly and clearly see the relationships between operators, whose roles change with each algorithm. Make direct changes to the pitch and volume for carriers and to the brightness of the sound or strength of the harmonics for the modulators. These controls give you sonic control over the unpredictability of FM just by subtracting and adding sounds as if you were using a mixer or drawbars.

There are 5 operator modes that expand beyond the traditional FM Sinae waves and include FM, ring modulation, filter, filter FM, and wave folder, as well as a wide range of waveforms. There are also 40 preset algorithms and user algorithms, which provide a combination of different operator roles and connections.

Beyond FM, the opsix provides a wide range of analogue-style modulation controls and filters including three ADSR envelope generators, three LFOs, and 12 virtual patches for a huge range of modulation sources. The 11 filter types include the radical MS-20 low-pass / high-pass filter, to the powerful yet soft Polysix low-pass filter that gives your sound a vintage feel; as well as two- or four-pole low-pass, high-pass, band-pass and band reject filters with resonance.

The opsix includes 30 high-definition effects of which three can be used simultaneously. You'll find stand offerings such as compression, AEQ, chorus, flanger, phaser and stereo delay, as well as distinctive effects like rotary speakers, grain shifters, and shimmering reverb effects that add a new dimensions to already remarkable sounds.

The powerful 16-step polyphonic sequencer allows you to record up to six notes per step, edit the velocity, gate time, and playback timing for each note, allowing you to create long phrases, or make subtle shifts in timing to emulate strums or drum rolls. A motion sequencer lets you record up to six parameters, creating smooth motion changes in sound within a phrase or building rhythms that change dramatically with each step.

Other notable features include randomisation, which provides you with unexpected sonic discoveries at the touch of a button and a spectrum analyser and oscilloscope which provide visual feedback to the distribution of harmonics that are caused by modulation, drawing you into a deep synthesiser vortex. The opsix ships with a 12 VDC power supply and includes a free bundle of music software including Korg's Gadget 2 LE, Module, and M1 LE collection, as well as Reason Studios Reason Lite, and iZotope Ozone Elements mastering software.

Key Features:

  • True six-operator FM synthesis and more
  • FM exploration, easier than ever
  • Full editing with the Data Entry rotary encoders
  • Five operator modes that expand FM synthesis
  • 40 preset algorithms and user algorithms
  • Three EGs, three LFOs and 12 virtual patches offer an extensive range of modulation.
  • Eleven powerful filters, including MS-20 and Polysix
  • Three series of 30 types of high-definition effects
  • Visually satisfying editing with a spectrum analyser and oscilloscope
  • Powerful 16-step polyphonic sequencer
  • Adding unpredictability to sounds with the Randomise feature
  • Favourite and smooth sound transition (SST) functions
  • Compact design featuring a 37-key keyboard
Software Bundle
Apps for iPad/iPhone:
  • KORG Gadget 2 Le (music production studio DAW app)
  • KORG Module (piano/keyboard sound module app)
Software for Mac/Windows:
  • KORG Collection - M1 Le (synthesiser sound module)
  • UVI Digital Synsations (synthesiser sound module)
  • AAS Ultra Analogue Session (synthesiser sound module)
  • AAS Strum Session (acoustic guitar sound module)
  • AAS Lounge Lizard Session (electric piano sound module)
  • Reason Studios Reason Lite (DAW music production software)
  • Skoove free 3 month trial of Skoove Premium (online piano lessons)
  • KORG Gadget 2 Le for Mac (DAW music production software)
  • iZotope Ozone Elements (audio mastering plug-in software)


Keyboard 37 Keys (Velocity and Release-Velocity Sensitive)
Sound Generation Altered FM Sound Generator
Polyphony 32 Voices (or Maximum of 24 Voices, Depending on Settings)
Structure 6 Operators
11 Filters
3 Envelope Generators
3 LFOs,
3 Effect Engines,
Step Sequencer
Algorithm 40 Presets + User Algorithm (Unique to Each Programme)
Operators 5 Modes: FM, Ring Mod., Filter, Filter FM, and Wave Folder
Oscillators 21 Waveforms: Sinae, Sinae 12-Bit, Sinae 8-Bit, 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
Filters 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
Envelope Generators 3 x ADSR
LFO 23 Waveforms: Triangle, Saw Down, Saw Up, Square, Sinae, 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 +
Virtual Patch 12 Routings
Effects 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 AEQ, 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
Sequencer / Arpeggiator Sequencer: Step Sequencer (Up to 16 Steps, Up to 6 Notes per Step), Motion Sequencer (Up to 6 Lanes)
Arpeggiator: 7 Patterns (Manual, Up, Down, Alt1, Alt2, Random, Trigger)
Programmes 500 (250 Preset Programmes and 250 User Programmes as the Factory-Set Default)
Favourite: 64 (16 Slots × 4 Banks)
Controllers Modulation Wheel, Pitch Wheel, Ratio OP 1-6 Knobs, Level OP 1-6 Sliders, Data Entry A-F Knobs
Inputs/Outputs Headphone: 1/4" / 6.35 mm Stereo
Output (L/Mono and R): 2 x Impedance-Balanced 1/4" / 6.35 mm TRS
Damper: 1/4" / 6.35 mm (Half-Damper Not Supported)
MIDI In and Out: 2 x 5-Pin DIN
USB Type-B Port
Power Power Supply: AC Adapter (12 VDC)
Power Consumption: 5 W
Dimensions (W x D x H) 22.2 x 13.3 x 3.6" / 56.5 x 33.8 x 9.2 cm
Weight 6.9 lb / 2.9 kg

In The Box

  • Korg Opsix Altered FM Synthesizer
  • Power Adapter
  • Software Bundle


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  • Product: Korg Opsix Altered FM Synthesiser
  • Manufacturer: Korg
  • Model: OP-SIX
  • RM Product #: 81736