The Behringer UB-Xa D is the compact, keyless desktop & rackmount module version of the standard UB-Xa synthesizer. It packs the exact same 16-voice bi-timbral analog engine, vintage chip architecture, and sound-shaping power into a significantly smaller footprint designed for studio desks and 19-inch equipment racks.

Core Voice Engine & Sound Architecture

• Identical Engine: Features 16 analog voices utilizing 2 VCOs per voice with oscillator sync mode.
• Vintage Component Clones: Built using modern reproductions of the legendary 3340 VCOs and 3320 VCFs to emulate original Oberheim circuitry.
• Waveforms & Filters: Selectable sawtooth, triangle, or square waveforms alongside a dual-slope 12/24 dB analog low-pass filter per voice.
• Bi-Timbral Layering: Allows split or layer configurations for two different patches simultaneously.
• Vintage Signatures: Includes a dedicated "Vintage Mode" offering 8 distinct hardware signatures (mimicking component variances of the OB-Xa, OB-8, and other eras).
• Envelopes & Modulation: Outfitted with 2 dedicated LFOs (7 waveform shapes), 2 ADSR generators per voice, and a stereo VCA per voice for independent pan control.

Desktop Design & Hardware Layout

• Ergonomic Controls: Retains 26 rotary encoders and a collection of physical tactile buttons for immediate sound manipulation.
• Menu Navigation: Utilizes a centralized push-encoder screen configuration to dive into advanced settings.
• Chassis Form Factor: Measures a compact 46 cm long, 22.41 cm wide, and 11.9 cm high.
• Rack Mounting: Ships with included 19-inch rack-mount brackets for secure integration into standard studio racks.

Digital Integration & Connectivity

• Expression Ready: Full software support for Velocity, Polyphonic Aftertouch, and MPE (MIDI Polyphonic Expression) when connected to a capable external controller. [1, 2, 3]
• Patch Capacity: Saves up to 512 user memory slots, including a reproduction of the original 1980s factory preset banks. [1, 2]
• Onboard Tools: Hosts a fully integrated dual-layer arpeggiator and a real-time transposable sequencer. [1, 2]
• Rear Panel IO:
• • Fully servo-balanced main outputs (Left, Right, Mono) and a headphone jack.
  • Control inputs for CV pedals (VCA/Filter) and footswitches (Sustain, Hold, Program Advance).
  • 5-Pin DIN MIDI (In/Out/Thru) and class-compliant USB Type-B for driverless computer DAW hookups.