The UB-Xa D is a desktop analog polyphonic synthesizer inspired by the legendary Oberheim OB-Xa (1980). It’s essentially the same engine as Behringer’s full UB-Xa keyboard version—but without keys, making it more compact and affordable.

• Type: Analog desktop synthesizer module
• Voices: 16-voice polyphony
• Timbrality: Bi-timbral (split/layer 2 sounds)

🔊 Sound Engine & Architecture

Oscillators (VCOs)

• 2 VCOs per voice → 32 oscillators total
• Waveforms: Saw, pulse, etc.
• Features:
• • Pulse Width Modulation (PWM)
  • Oscillator sync
  • Unison mode (thicker sound)

👉 Result: Huge, warm, classic analog tones—pads, brass, and leads.

Filters (VCF)

• Classic analog low-pass filter
• Switchable:
• • 12 dB (2-pole)
  • 24 dB (4-pole)
• Based on vintage chip designs (3320-style)

👉 Gives that iconic “Oberheim sweep” sound.

Envelopes & LFOs

• Multiple envelopes for filter & amp
• Dual LFOs with multiple waveforms
• Advanced modulation routing

🎚️ Modulation & Performance FeaturesModulation Matrix

• 8-channel modulation matrix
• Flexible routing (LFO → filter, aftertouch → pitch, etc.)

Expressive Control

• Supports:
• • Velocity
  • Polyphonic aftertouch
  • MPE compatibility (modern controllers)

👉 This is a big upgrade vs vintage synths.

🎹 Vintage Modes (Signature Feature)

One of the coolest features:

• 8 selectable “Vintage Modes”
• Emulate different synth behaviors:
• • OB-Xa
  • OB-8
  • “Creamy”, “Bright”, “Gnarly”, etc.

👉 These subtly change tuning, drift, and character—like owning multiple vintage synths in one.

🎛️ Presets & Memory

• 512 user presets
• Includes original factory patches from the OB-Xa
• Quick-access preset buttons for live use

🔌 Connectivity

Typical modern studio integration:

• MIDI In/Out/Thru
• USB MIDI
• Audio outputs (stereo)
• Expression pedal / control inputs

👉 Works easily with DAWs and MIDI controllers.

🧠 Multitimbral Capability

• Bi-timbral (2-part)
• You can:
• • Split keyboard zones
  • Layer two sounds

👉 Example: Bass + pad simultaneously.

📏 Form Factor (Why “D” Version Exists)

• Desktop module (no keyboard)
• Designed for:
• • Smaller studios
  • Modular rigs
  • MIDI controller users

Behringer released it because the keyboard version is quite large, and many users wanted a compact option .

🔥 Sound Character

• Thick, warm, analog tone
• Famous for:
• • 80s synth brass
  • Pads
  • Poly leads
• Used historically in music by artists like:
• • Prince
  • Van Halen
  • The Police

👉 The UB-Xa D recreates that classic “cinematic analog” vibe.

✅ Pros

• True analog signal path
• 16 voices (more than original OB-Xa)
• Poly aftertouch + MPE support
• Vintage modes = multiple tonal flavors
• Much cheaper than real Oberheim

❌ Cons

• No built-in keyboard
• No onboard effects (you’ll need external FX)
• Interface slightly menu-based vs knob-per-function
• Behringer QA can be inconsistent (reported by some users)