OXI Instruments Coral – 8-Voice Polyphonic Eurorack Synthesizer Module

The OXI Instruments Coral is a fully-featured 8-voice polyphonic synthesizer packed into just 14HP of Eurorack space. Born from admiration for Mutable Instruments' Plaits, it expands those sound engines across eight independent voices — each with its own filter, amplifier, envelopes, and effects sends — creating a complete multitimbral synth or groovebox inside your modular system. Whether you're layering lush pads or building full tracks with drums and bass, Coral brings serious power to any rack — explore it at Soundium.

Key Features

• 8-Voice Polyphony: Eight independent voices, each with up to 8 oscillators — 64 oscillators total running simultaneously
• 19 Sound Engines: Virtual analog (Moog-style 3VCO), FM, wavetable, waveshaping, MDO, Acid, string, modal, drum synths (kick, snare, hi-hat), particle noise, and WAV player — with more engines planned
• Multi-Part Capability: Split voices into up to 10 independent parts, each with its own engine, filter, envelope, FX send, and MIDI channel
• Built-in Effects: Reverb, chorus, and delay with per-voice send control for spatial layering
• MPE Support: Full MPE compatibility for expressive polyphonic control
• Complete MIDI Integration: Control any parameter via MIDI CC — pairs perfectly with OXI One or any polyphonic sequencer
• CV/Gate Inputs: 8× CV inputs (±5V, ±10V max) and 1× Gate input for direct modular integration
• Dual-Knob Interface: Timbre, Harmonics, Oct, and Morph parameters surrounding a central encoder with secondary functions
• MicroSD Slot: Load custom wavetables and WAV samples

Customer Benefits

Coral replaces an entire rack of oscillators, filters, and VCAs with a single 14HP module that delivers eight fully independent synth voices. The multitimbral capability means you can run bass, pads, leads, and drums simultaneously from one module, controlled via MIDI or CV. With 19 engines and counting, it keeps evolving through firmware updates — making it a long-term investment for your modular setup.

Quick Specs

• Format: Eurorack, 14HP
• Depth: 3 cm
• Voices: 8 polyphonic / 10-part multitimbral
• Sound Engines: 19 (expanding via firmware)
• Outputs: 2× mono DC-coupled (±5V)
• Inputs: 8× CV (±5V), 1× Gate, 1× MIDI TRS (Type A & B)
• Effects: Reverb, Chorus, Delay
• Power: +12V 110 mA, -12V 10 mA

What's in the Box

• OXI Instruments Coral module
• Eurorack power cable
• Quick start guide

Use Cases / Ideal For

Ideal for modular synthesists who need polyphonic capability in minimal space, electronic musicians building dawless setups, sound designers exploring diverse synthesis methods, and live performers who want a complete multitimbral groovebox within their Eurorack system.

Compatibility

Compatible with any standard Eurorack system (3U, ±12V power). MIDI TRS input works with Type A and Type B connections. Pairs with OXI One, OXI E16, Arturia KeyStep, and any MIDI controller or sequencer. MicroSD card for custom wavetables and samples. Firmware updates via the OXI Configurator app.

Pros & Cons

✅ Pros:

• 8 full polyphonic voices in only 14HP — exceptional density
• 19 diverse sound engines with more coming via firmware
• True multitimbral operation — run multiple instruments simultaneously
• Built-in effects with per-voice routing
• MPE support for expressive performance

⚠️ Cons:

• No screen — learning the LED-based interface takes time with the manual
• Menu-diving via encoder can be fiddly in a compact panel

Packing eight polyphonic voices, 19 sound engines, and built-in effects into a single 14HP module, the OXI Instruments Coral is a modular powerhouse that keeps growing with every firmware update — get it at Soundium.