The Korg Opsix represents a revolutionary approach to FM synthesis, taking this classic synthesis method far beyond its traditional boundaries. This compact 37-key synthesizer builds upon the foundation of 6-operator FM synthesis while introducing groundbreaking innovations that create entirely new sonic possibilities.
At its core, the Opsix features six highly versatile operators, each capable of operating in five distinct modes: traditional FM, ring modulation, filter, filter FM, and wave folding. This flexibility allows for sound creation that extends well beyond conventional FM synthesis, enabling everything from classic DX7-style electric pianos to completely unique textures that would be impossible on traditional FM synthesizers.
The instrument offers an impressive array of 21 initial waveforms per operator, including various sine wave resolutions, triangle, sawtooth, square waves, additive waves, and noise generators. With 40 preset algorithms plus a user-programmable algorithm slot, sound designers have unprecedented control over operator routing and interaction.
Programming is made intuitive through color-coded controls - red for carriers, blue for modulators, and purple when an operator functions as both. The six ratio knobs and six level sliders provide immediate hands-on control, while the comprehensive modulation matrix with 12 routing slots and multiple LFOs and envelope generators enable complex, evolving sounds.
The built-in step sequencer supports up to 16 steps with 6 notes per step, complemented by motion sequencing across 6 lanes for parameter automation. The arpeggiator offers 7 patterns with extensive customization options. Three effects units in series provide professional polish with 30 different effect types including modulation, distortion, delay, and reverb options.
Despite its compact form factor (weighing just 2.9kg), the Opsix delivers 32-voice polyphony and includes thoughtful features like Smooth Sound Transition for seamless program changes during performance. The instrument comes bundled with extensive software including Korg Gadget 2 and offerings from various partner companies.
While the 37-key keyboard may limit some performance applications, the Opsix excels as both a desktop synthesizer and MIDI-controlled sound module, offering a perfect balance of portability and sonic capability for modern music production.
Technical Specifications
Keyboard
- Keys: 37 keys
- Sensitivity: Velocity and release-velocity sensitive
- Aftertouch: MIDI only (no onboard aftertouch generation)
Sound Engine
- System: Altered FM sound generator
- Maximum Polyphony: 32 voices (24 voices with HD waveforms)
- Voice Modes: Polyphonic, Monophonic, Legato
- Unison: 2-8 voices with programmable detune and stereo spread
Structure
- Operators: 6 operators
- Filter: 1 resonant filter section
- Envelope Generators: 3 EGs (ADSR type)
- LFOs: 3 LFOs
- Effects: 3 effects units (series)
- Sequencer: Step sequencer, Motion sequencer
- Arpeggiator: Built-in with 7 patterns
Algorithms
- Presets: 40 preset algorithms
- User Algorithm: 1 programmable algorithm per program
- Feedback: Programmable maximum feedback amount
Operators
- Modes: 5 modes (FM, Ring Modulation, Filter, Filter FM, Wave Folder)
- Waveforms: 21 waveforms per operator
- 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
- Ratio Range: 1/128 to standard ratios
- Phase Modes: Key-sync, Key-sync with random phase, Random
Filter Section
- Types: 11 filter 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
- Features: Resonance, Key tracking, Self-oscillation capability
Envelope Generators
- Type: ADSR (4-stage)
- Curve Options: Linear to exponential for Decay and Release stages
- Assignment: Dedicated EG per operator plus 3 additional EGs
LFOs
- Waveforms: 23 waveforms including:
- Triangle, Saw Down, Saw Up, Square, Sine, Sample&Hold
- Guitar, Exponential variants, Step sequences
- Random variations, Positive-only waveforms
- Sync: Clock sync and key sync capable
- Control Sources: 13 control sources for LFO1
Modulation Matrix (V.Patch)
- Routings: 12 modulation routings
- Sources: 16 modulation sources (including MIDI CC, aftertouch, poly-aftertouch)
- Controllers: 13 controller options for modulation amount
- Destinations: 77 possible destinations
Effects
- Units: 3 effects in series
- Types: 30 effect types including:
- Modulation: Chorus, Phaser, Flanger, Auto Pan, Rotary Speaker
- Filter: Auto Wah, LFO Filter
- Distortion: Distortion, Guitar Amp, Decimator
- Dynamics: Compressor, Master Limiter, Enhancer, Exciter
- Delay: Delay, Tape Echo, Autopan Delay (BPM sync available)
- Reverb: Reverb, Shimmer Reverb, Spring Reverb, Early Reflection
- Utility: 3-Band EQ, Grain Shifter
Sequencer
- Step Sequencer: Up to 16 steps, up to 6 notes per step
- Motion Sequencer: Up to 6 lanes for parameter automation
- Playback Modes: Forward, Backward, Alternate, Center, Even/Odd, Random
- Features: Real-time and step recording, swing, offset timing
Arpeggiator
- Patterns: 7 patterns (Manual, Up, Down, Alt1, Alt2, Random, Trigger)
- Range: 1-4 octaves
- Control: Programmable resolution, gate time, modulation via matrix
Memory
- Programs: 500 total (250 preset + 250 user programs)
- Favorites: 64 slots (16 slots × 4 banks)
- SysEx Compatibility: DX7/TX7 bank import with conversion
Special Features
- Smooth Sound Transition: Hold notes for up to 60 seconds during program change
- Color-Coded Programming: Visual operator identification (red/blue/purple)
- Built-in Oscilloscope: Visual waveform analysis
- LoFi Mode: Reduced resolution for vintage character
- Portamento: Two modes with up to 50-second transition time
Controls
- Wheels: Modulation wheel, Pitch wheel
- Operator Controls: Ratio knobs (OP 1-6), Level sliders (OP 1-6)
- Data Entry: 6 knobs (A-F) for parameter control
- Additional: 22 buttons for sequencer, arpeggiator, and favorites
Connectivity
- Audio Outputs: L/MONO and R (6.3mm TRS, impedance-balanced)
- Headphones: 6.3mm stereo jack
- MIDI: 5-pin DIN In and Out
- USB: Type B (MIDI and librarian, no audio)
- Pedal Input: 1 × 6.3mm jack (sustain pedal, half-damper not supported)
MIDI Implementation
- Standard: MIDI v2 compliant CCs
- Features: All top panel controls send appropriate CCs
- Transmission: Notes and sequences (arpeggiator notes, not output)
Power
- Power Supply: External 12V DC adapter
- Power Consumption: 5W
Dimensions&Weight
- Dimensions: 565 × 338 × 90 mm (22.24" × 13.31" × 3.54")
- Weight: 2.9 kg (6.93 lbs)
Included Items
- AC adapter
- Extensive software bundle (Korg Gadget 2, Module, M1 Le, and partner software)
Optional Accessories
- DS-1H damper pedal
- PS-1 pedal switch
- PS-3 pedal switch
