The UDO Audio Super Gemini represents a bold evolution in analog-hybrid synthesis, delivering a dual-layer architecture that essentially doubles the acclaimed Super 6 engine. This flagship instrument combines the refined character of classic analog polysynths with modern digital precision, creating a powerful 20-voice polyphonic synthesizer that can compete with legendary instruments like the Roland Jupiter-8 and Yamaha CS-80.

At its core, the Super Gemini features two complete synthesis layers (Upper and Lower), each equipped with its own set of controls distinguished by white and orange fader caps respectively. This dual-layer design enables complex layered textures, keyboard splits, and independent sequencing, making it feel like having two Super 6 synthesizers in a single instrument.

The synthesizer's standout feature is its true-stereo Binaural signal path, powered by dual FPGAs and twin effects processors. When engaged, this mode creates immersive stereo imaging but halves the available voices (10 Binaural voices vs 20 mono voices). Each layer can operate in Binaural mode independently, offering maximum flexibility.

Sound-wise, the Super Gemini delivers a "classy" character that's refined, spacious, and detailed. It excels at everything from Vangelis-style space leads and ambient pads to Juno basses and '80s pop synths. The build quality matches the sound quality, with superb construction and an attractive white, grey, and orange aesthetic that commands attention in any studio.

The instrument prioritizes tactile control with minimal menu diving, offering immediate access to nearly every parameter through dedicated hardware controls. Performance features include poly aftertouch, a custom ribbon controller, and four pedal inputs including a unique delay freeze function.

Technical Specifications

Architecture & Polyphony

• Voices: 20-voice polyphonic (mono mode) / 10-voice polyphonic (Binaural mode)
• Architecture: Dual-layer bitimbral analog-hybrid synthesizer
• Voice Assignment: 4 selectable modes (2 monophonic, 2 polyphonic). Voices and layers can be split, doubled, and sequenced
• Binaural Mode: True stereo processing with option to disable for full mono output
• Unison Modes: 8 selectable unison modes
• Layer Modes: Single, Dual (stacked), Split

Oscillators (per layer)

• DDS1 (Digital Direct Synthesis 1):
  • Super mode with 7 unison copies
  • Standard analog-type waveforms + 16 single-cycle waveforms
  • Wave morphing between Wave A and Wave B (assignable from 16 waveforms)
  • Cross modulation, ring modulation, bi-directional sync
• DDS2 (Digital Direct Synthesis 2):
  • Standard analog waveforms with pulse-width modulation on square wave
  • Can function as LFO or sub-oscillator (phase-locked octave below DDS1)
  • No unison or single-cycle waveforms
  • Used for cross-modulation of DDS1

Filters (per layer)

• Low-Pass Filter: 24dB/octave analog SSI design (based on SSM2044 chip)
• High-Pass Filter: Variable control (improved from Super 6's 3-position switch)
• Filter Drive: Adjustable
• Filter FM: Available from DDS2

Envelopes & LFOs (per layer)

• Envelopes: 2 per layer
  • Envelope 2: Standard amp envelope with switchable gated modes
• LFOs: 2 per layer
  • LFO2: Assignable for vibrato and tremolo (common to both layers)

Effects (per layer)

• Chorus: Juno-style with stackable I and II settings (3 strengths total)
• Delay: BBD-style analog delay with freeze function
• Signal Path: True-stereo Binaural with dual FPGAs and twin effects processors

Modulation System

• Modulation Matrix: 8×8 matrix with pre-defined sources and destinations
• Additional Destinations: Up to 25 more via direct parameter mapping
• Matrix Sources: DDS2, LFO2, Envelope 1, Velocity, Aftertouch, Expression Pedal, Ribbon, Key Tracking
• Matrix Destinations: LFO 1 Speed, Cross-Modulation, Wave Morph, Oscillator Mix, High-Pass Filter, Low-Pass Resonance, Envelope Decay, Delay Time
• LED Feedback: Clear indication of mappings and modulation amounts

Keyboard:

• 61-note semi-weighted keybed
• Polyphonic aftertouch

Performance Controls

• Ribbon Controller: Custom engineered for individual note articulation
• Pitch/Mod Stick: Combined pitch wheel and modulation control
• Master Controls: Volume, Tempo, Lower Layer Detune
• Hold Modes: Individual for each layer

Memory & Presets

• Performances: 128 slots (dual-layer configurations)
• Patches: 256 slots (single-layer sounds)
• Waveforms: 32 interchangeable
• Sequences: 16 for storing and editing

Sequencer & Arpeggiator

• Sequencer: 64 steps, up to 12 notes per step
• Features: Ties, rests, accents, chord memory function
• Arpeggiator: Multiple playback patterns, octave ranges, swing
• Timing: Master tempo with individual clock divisions per layer

Connectivity

• Audio Outputs:
  • Stereo mix output (1/4" jack)
  • Separate stereo outputs for Upper and Lower layers (1/4" jack)
• MIDI: Full-size In, Out, Thru ports
• USB: Type-B connector for MIDI and file management
• Pedal Inputs: 4 total (1/4" jack)
  • Sustain (auto polarity detection)
  • Expression (TRS)
  • Volume (TRS)
  • Delay Freeze
• Power: IEC mains cable input (built-in power supply)

MIDI Implementation

• Bi-timbral: Separate MIDI channels for each layer
• Channel Assignment: Global channel (1-15) for Upper layer, Lower layer automatically assigned to next channel
• MPE Support: Compatible (for external MPE controllers)
• Note: MPE functionality was absent in v1.12 firmware but planned for future implementation

Additional Features

• Delay Freeze: Sound-on-sound looping capability via pedal input
• File Management: USB connectivity for sound transfer and backup
• No Screen Design: Emphasizes hands-on control without menu diving

Physical Specifications

• Dimensions: 1040 × 440 × 110mm
• Weight: 14.5kg
• Color Scheme: White, grey, and orange