The TB-303 defined acid house in the 1980s, and Behringer's TD-3 brought that legendary sound back to life at a price that makes no excuses for itself. Released as a faithful analog recreation rather than a digital emulation, it's become the synth that reignited the acid movement on a global scale, proving that great bass synthesis doesn't require a five-figure price tag.
Under the hood sits a single voltage-controlled oscillator with selectable sawtooth and square waveforms, feeding into a resonant 4-pole low-pass filter with envelope modulation and decay controls. The filter can switch between 18dB and 24dB slopes, giving you flexibility in how aggressive or smooth you want the cutoff sweeps to sound. You get a 16-step sequencer with seven tracks and room for 250 user patterns, plus slide and accent controls to add expression and movement to your sequences. The distortion circuit, modeled after the Boss DS-1 pedal, adds grit and harmonics when you need them. Connectivity includes MIDI over both 5-pin DIN and USB, CV and gate I/O for modular integration, and a filter input for processing external audio. The compact desktop format measures just over a foot wide, making it easy to fit into any setup.
The community has embraced it as a genuine acid machine that captures the warm, punchy character of the original while adding modern conveniences like MIDI and USB that the 303 never had. The sequencer maintains that famously quirky split between pitch and time entry that some find laborious but others credit as the secret sauce behind classic acid lines. The distortion gets mixed reviews for subtlety, and the build quality is plastic rather than tank-like, but for the price these are minor trade-offs. Players consistently praise the authentic analog sound and the sheer fun factor of coaxing squelchy, resonant bass lines out of something so affordable.
