Korg opsix MKII – 37-Key Altered FM Synth with 64 Voices

The Korg opsix MKII evolves FM synthesis with intuitive controls and expressive performance. Featuring a vibrant operator mixer with backlit faders, expanded polyphony, deep modulation, and modern connectivity—this isn’t just an update, it’s a reimagination of FM sound design, brought to life through Soundium quality.

Key Features

• Expanded 64-voice polyphony: Doubles the capacity of the original for lush, layered sounds without compromise
• Illuminated operator mixer: Six faders that light up red for carriers and blue for modulators—making FM synthesis hands-on and intuitive
• Versatile synthesis engine: Six operators, 40 preset algorithms plus a user-defineable algorithm, and six operator modes (FM, Ring Mod, Filter, Filter FM, Wave Folder, Effect)
• Rich modulation and effects: Three ADSR envelopes, three LFOs with 23 waveforms, 12 virtual patch routings, three effect blocks offering 30 high-definition effects
• Dynamic sequencing: 16-step polyphonic motion sequencer (up to six notes per step, with per-step motion lanes), plus a seven-pattern arpeggiator

Customer Benefits

The opsix MKII offers deep sound design without complexity. It brings expressive tools and performance control to FM synthesis, making it accessible for both sound explorers and seasoned users in studio or live environments.

Quick Specs

• Dimensions: 56.5 × 33.8 × 9.0 cm
• Weight: 2.9 kg
• Keyboard: 37 velocity- and release-velocity-sensitive keys
• Polyphony: 64 voices
• Programs: 500 total (350 factory, 150 user) with 64 favorite slots
• Sequencer & Arp: 16-step sequencer with motion lanes, arpeggiator with seven patterns
• I/O: Stereo outputs, headphone out, MIDI In/Out, USB-B, sustain pedal input

What’s in the Box

• Korg opsix MKII synthesizer
• AC power adapter
• Quick start guide

Use Cases / Ideal For

Perfect for producers, performers, and sound designers craving expressive FM textures with hands-on control. Ideal in both studio racks and live setups where clarity, depth, and performance pace matter.

Compatibility

Fully compatible with opsix Native and original opsix sound libraries. Easily integrates via USB and MIDI with DAWs and controller setups. Works seamlessly with modern MIDI workflows.

Pros & Cons

✅ Pros:

• Expressive and user-friendly operator mixer
• Large polyphony allows layered textures without voice stealing
• Deep modulation and effects engine offers vast sonic possibilities

⚠️ Cons:

• Complex FM architecture may require a learning curve
• No aftertouch on keyboard—expression depends on external controllers

The Korg opsix MKII is a powerful yet accessible evolution of FM synthesis. With expansive polyphony, intuitive design, and expressive sequencing—it’s a creative powerhouse shaped by Soundium.