KORG opsix module - 19" “Altered FM” digital synthesizer module with 80 voices and Poly Aftertouch support

KORG opsix module - 19" “Altered FM” digital synthesizer module with 80 voices and Poly Aftertouch support

The Korg opsix module brings the acclaimed Altered FM synthesis of the opsix mk II to a 19" rack-mount or desktop module , while retaining the iconic Operator Mixer that simplifies FM, making it fast, visual, and creative. This version adds support for MIDI 2.0 Property Exchange and Polyphonic Aftertouch for exploiting per-note nuances with modern controllers (e.g., Keystage), and offers a maximum polyphony of 80 voices in a lightweight, portable chassis. It's fully compatible with sounds from the original opsix, opsix mk II , opsix SE , and opsix native software, so you can swap libraries and projects seamlessly. The panel retains all the controls from the keyboard models, with professional-grade connectivity and a clean integration layout (recessed rear-panel connectors and stand-mounted feet for desktop-mounted front panels).

Main features

• “Altered FM” engine based on 6 operators and 40 algorithms (plus user algorithm per program) with operator modes: FM, Ring Mod, Filter, Filter FM, Wave Folder and Effect.
• Maximum 80-voice polyphony for complex layers and effects tails without clipping.
• Modern compatibility : MIDI 2.0 Property Exchange and Poly Aftertouch (also Channel Aftertouch) with hundreds of presets already updated to respond to PolyAT.
• 19" module format for standard rack or desktop use , with the same panel and controls as the key models.
• Library and sequencing : 500 programs (350 presets + 150 user default), 64 favorites (16×4), 16-step step sequencer (up to 6 notes/step) and motion sequencer with up to 6 tracks , arpeggiator with 7 patterns.
• Modeling & Modulation : 23 oscillator shapes, 11 filter types (includes LPF/HPF MS-20 and POLY6 ), 3 EG, 3 LFO with 23 shapes and 12 Virtual Patch routes.
• Internal effects (3 blocks) with 30 types (chorus/ensemble, phaser/flanger BPM, rotary, compressor/limiter, distortion, tape echo , shimmer reverb , etc.).
• Connectivity : L/Mono and R outputs (balanced TRS), stereo headphones, Damper input (no half pedal), MIDI In/Out DIN and USB-B (MIDI) .
• Installation design : Recessed rear panel connectors for improved cable management; brackets included for adjusting the panel angle on a desktop.
• Dimensions and weight : 482 × 172 × 104 mm ; 1.7 kg . Power supply via 12 V DC adapter; consumption approx. 5 W.

Product benefits

• Hassle-free FM : The Operator Mixer offers direct operator control of ratio and level, with immediate visual feedback.
• Ready for the modern studio : Poly Aftertouch and Property Exchange make mapping, integration, and per-note expressiveness easy with today's controllers.
• More voices, more layers : 80 voices for extended pads, sequencing with reverb tails, and timbre stacking without voice stealing.
• Versatile form factor : 1U+α high (104mm) and standard 19" wide, fitting into racks or desks with adjustable angles.
• Unified ecosystem : Share patches with opsix mk II , opsix SE , and opsix native ; expand your palette with official and third-party packs.

Use cases

• Hybrid Production : Detailed FM/AM/Wavefolding editing with step automation and print-ready internal effects.
• Direct with controller : combine the module with a poly aftertouch keyboard for per-note expressiveness without increasing the weight of the set.
• Sound Design : Create evolving bells, wavefolding basses, and spectral textures using 11 filters and 30 effects.

Frequently Asked Questions

• Does it come with a keyboard? No, it's a module with the same controls as the key models, designed for rack or desktop use.
• Does it have USB audio? No. The USB port is for MIDI ; audio comes out through the L/R outputs.
• Can I use my opsix/opsix native sounds? Yes, it's fully compatible with opsix original, opsix mk II , opsix SE , and opsix native .
• Does Poly Aftertouch work? Yes, and many presets are already prepared; you need a controller that supports PolyAT .

Description for projects

Korg opsix module (Altered FM) digital synthesizer module for 19" rack or desktop; max. polyphony 80 voices ; program structure: 6 operators, 40 algorithms + user algorithm, 1 filter (11 types), 3 EG, 3 LFO, 12 Virtual Patch routes; oscillator with 23 shapes; internal effects: 3 blocks with 30 types; 16-step step sequencer (up to 6 notes/step) and motion sequencer for up to 6 tracks; 7-pattern arpeggiator; 500 programs (350 presets + 150 user default), 64 favorites; MIDI 2.0 Property Exchange compatibility, Poly/Channel Aftertouch ; connectivity: L/Mono and R output (balanced TRS), headphones, Damper input (without half pedal), MIDI In/Out DIN, USB-B (MIDI); power supply: DC 12 V, consumption approx. 5 W; dimensions 482 × 172 × 104 mm ; weight 1.7 kg .