Behringer TD-3-MO Synthesizer Black

Behringer TD-3-MO Black — Devil Fish-Modded Analog Acid Engine

The Behringer TD-3-MO Black is a "modded-out" analog bass-line synthesizer that revives the legendary Roland TB-303 with the most coveted Devil Fish modifications built in. Designed for the throbbing rhythms and greasy bass lines of acid house, techno, and electro-funk, this desktop module delivers the unmistakable squelch and resonance that made the original an icon. An all-analog VCO, VCF, and VCA signal path keeps the vintage character intact.

Devil Fish Upgrades and Poly Chain Expand the Classic

What separates this model from a standard TB-303 reissue is the integrated Devil Fish mod package: MIDI CC filter control, variable slide time up to six times longer than stock, a three-mode Sweep Speed switch, an Accent Sweep switch with high-resonance mode, a Soft Attack control, Filter FM, a sub-oscillator, overdrive, and a post-VCA "muffler" distortion. Thirteen mini key buttons let players perform live, while Poly Chain links multiple units for up to 16-voice polyphony.

Analog Sound Engine — VCO, VCF, and VCA

Built around a single analog VCO switching between sawtooth and square waveforms, the signal routes through transistor wave-shaping into a 4-pole resonant low-pass ladder filter. Cutoff, resonance, envelope, decay, and accent shape the squelch, while the sub-oscillator adds an extra octave of low-end weight.

• Oscillators: 1x analog VCO with switchable sawtooth and square waveforms
• Filter: 4-pole analog ladder low-pass with cutoff, resonance, envelope, decay, and accent
• Sub-Oscillator: switchable output level for added low-end depth

Sequencer and Programming Workflow

Sixteen steps across seven tracks capture notes, rests, accents, slides, and parameter automation, with 250 user patterns stored across four groups. Step mode suits precise pattern design; Keyboard mode enables real-time performance and recording. A built-in arpeggiator adds evolving motion without external gear.

• Sequencer: 16 steps, 7 tracks, 250 user patterns across 4 groups
• Polyphony: 1 voice (monophonic), expandable to 16 voices via Poly Chain
• Arpeggiator: built-in for evolving melodic patterns

Connectivity, Controls, and Build

Despite its compact footprint, the unit packs 15 controls and 33 switches for direct real-time access to every parameter. MIDI In and Out/Thru on 5-pin DIN plus class-compliant USB-B MIDI integrate with any DAW or hardware rig. Thirteen 1/8" / 3.5 mm patch points expose CV, Gate, Filter FM, Filter CV, Accent, Slide, and Sync.

• Dimensions: 305 x 165 x 56 mm — fits any studio desk or live setup
• Weight: 1.4 kg for portable gigging
• Power Consumption: 4 W via included 9V DC adapter

Who Should Choose the Behringer TD-3-MO Black

This desktop module is the right choice for electronic music producers, sound designers, and live performers who want the unmistakable TB-303 voice with modern connectivity. Acid house and techno producers will appreciate the Devil Fish mods that push the filter into new territory, while Eurorack users gain 13 patch points for modular integration. Beginners can lean on the 250-pattern memory and arpeggiator to start programming acid bass lines.

The TB-303 Legacy and the Devil Fish Mod

Released in 1981 as an accompaniment tool, the original Roland TB-303 Bass Line quickly became the voice of acid house after producers discovered its resonant filter and sequencer. By the late 1980s, circuit benders had modified their units — the "Devil Fish" mod being most famous — adding MIDI control, variable slide time, and overdrive. This unit packages those legendary modifications into an affordable desktop module.