Korg opsix Module – Rack-Friendly Altered FM Synthesizer

The Korg opsix Module brings the full power of its keyboard sibling into a flexible rack/desktop format. Powered by intuitive “operator mixer” controls, MIDI 2.0, polyphonic aftertouch, and heavyweight FM sound design wrapped in a compact 19-inch, 4U chassis.

Key Features

• Altered FM engine with operator mixer: Six operators made easy to manipulate with faders that show carriers in red and modulators in blue
• Massive 80-voice polyphony: Handles dense layers and long sequences without voice stealing
• MIDI 2.0 & polyphonic aftertouch: Modern connectivity and expressive performance features
• Rack/desktop design: 19-inch chassis with recessed rear jacks and adjustable desktop brackets for ergonomic use

Customer Benefits

This module gives you the full opsix sound engine and workflow, minus the keys—ideal for modular racks or setups already using external controllers. The operator mixer keeps FM intuitive and hands-on, while high polyphony ensures rich, evolving textures.

Quick Specs

• Dimensions: 48.2 × 17.2 × 10.4 cm
• Weight: 1.7 kg
• Polyphony: 80 voices
• Controls: Operator mixer with visual feedback, OLED display, performance knobs
• Connectivity: USB-B, MIDI In/Out, stereo outputs, headphone output, sustain pedal input
• Included: AC adapter, desktop brackets

What’s in the Box

• Korg opsix Module synthesizer
• AC power adapter
• Desktop angle brackets
• User manual

Use Cases / Ideal For

Perfect for producers, keyboardists, and sound designers who want the opsix engine in a rack-friendly format. Suited for hybrid studios, portable rigs, or live performance setups where space efficiency matters.

Compatibility

Works with opsix software tools and libraries, including opsix Native. Seamlessly integrates with DAWs and MIDI controllers, supporting polyphonic aftertouch and modern MIDI 2.0 workflows.

Pros & Cons

✅ Pros:

• All opsix synthesis features in a compact rack unit
• Intuitive operator mixer for hands-on FM control
• High polyphony and expressive MIDI features

⚠️ Cons:

• No built-in keyboard—requires an external controller
• FM synthesis depth may take time to master

The Korg opsix Module delivers the power of Altered FM synthesis in a space-saving design. For expressive, evolving sound creation in any rig.