Behringer TD-3-MO-AM

Behringer TD-3-MO-AM Analog Bass Line Synthesizer — Modded-Out Acid Powerhouse

The Behringer TD-3-MO-AM is a monophonic analog bass line synthesizer that channels the unmistakable squelch of the Roland TB-303, then layers on the most coveted third-party mods straight from the factory. Inspired by the legendary Devil Fish modification, this desktop module delivers the throbbing, resonant bass tones that launched acid house and continue to fuel techno, electro, and synth-wave productions. With its pure analog signal path and 13 mini key buttons, the unit feels immediate and hands-on. The TD-3-MO-AM is the right choice for electronic producers and live performers chasing authentic 303 character without hunting down a vintage unit.

Devil Fish Mods and Analog Soul in a Compact Desktop Module

What separates this "modded-out" version from the standard TD-3 is the inclusion of features once reserved for circuit-bent originals. A MIDI CC-controllable filter, variable slide time control, three-mode Sweep Speed switch, and Accent Sweep switch open up performance possibilities the original could never reach. The onboard sub-harmonics oscillator drops the signal an extra octave for chest-rattling low end, while a post-VCA "muffler" distortion circuit adds aggressive bite. Filter FM modulation routes the VCA output back into the filter frequency for screaming, self-oscillating textures.

Analog Oscillator and Filter — The Heart of the Acid Sound

The single analog VCO and 4-pole resonant low-pass filter are the engine room of every squelchy bassline this machine produces. Sawtooth and square waveforms can be tuned, shaped, and overdriven, while the filter's cutoff, resonance, envelope, decay, and accent controls let players carve everything from subtle wobble to screaming leads.

• Oscillators: Analog VCO with sawtooth and square waveforms — the foundation of every classic 303-style bass tone
• Filter: 4-pole low-pass resonant VCF — adds the squelch, bark, and self-oscillation that defines acid
• Sub-Oscillator: Switchable sub-harmonics with level control — drops the signal one octave for deeper low end

Sequencer and Pattern Programming — Pattern Power at Your Fingertips

The onboard sequencer turns the TD-3-MO-AM into a self-contained groove box. Patterns can be built in Step mode or recorded live in Keyboard mode using the 13 mini key buttons, with programmable accents and slides adding the classic 303 feel. Up to 250 user patterns can be stored across 4 groups, and the integrated arpeggiator generates evolving melodic textures.

• Sequencer: 16-step, 7-track with 250 patterns in 4 groups — enough storage for an entire live set
• Polyphony: 1 voice (monophonic), expandable to 16 voices via Poly Chain — link multiple units for chords and stacks
• Arpeggiator: Built-in with wide pattern range — produces evolving sequences and sound effects

Connectivity and Control Surface — Studio and Stage Ready

Despite its compact footprint, the TD-3-MO-AM offers a generous patchbay and full MIDI implementation for both studio and stage use. 15 controls and 33 switches provide direct, real-time access to every important parameter without menu diving. CV/Gate I/O and 13 patch points invite integration with Eurorack and modular setups.

• MIDI I/O: 5-pin DIN In/Out/Thru plus USB-MIDI — integrates with DAWs and hardware sequencers
• CV/Gate: 1/8" CV and Gate In/Out at 0 to +5 V (1 V/Octave) — bridges to modular and vintage gear
• Patch Points: 13x 1/8" / 3.5 mm — extensive routing for external sound shaping

Who Should Choose the Behringer TD-3-MO-AM

The TD-3-MO-AM is the right choice for electronic music producers, live performers, and sound designers who need authentic analog acid bass without the cost or fragility of a vintage TB-303. House, techno, acid, and synth-wave producers will feel at home programming patterns on the 13 mini key buttons and tweaking the 4-pole filter in real time. Educators and students of synthesis benefit from the hands-on layout that exposes every parameter without menus. Anyone curious about modular patching will appreciate the 13 patch points and CV/Gate I/O for experimenting with external gear.

Behringer and the Legacy of the TB-303

Behringer was founded by Uli Behringer, who built his first synthesizer — the UB-1 — at age 17 in his family home in Baden, Switzerland, after learning electronics from his father. The TD-3-MO-AM pays tribute to the Roland TB-303, originally released in 1981 as a bass-guitar accompaniment tool that flopped commercially before being rediscovered by Chicago's acid-house pioneers in the late 1980s. Over the following decades, hobbyists developed mods like the celebrated Devil Fish modification to push the 303 beyond its original design. Behringer's "modded-out" version packages the most popular of those tweaks into an affordable, reliable unit ready for modern studios.