Born from a graduate student's obsession with reverse-engineering the Roland TB-303, the x0xb0x became one of the most respected acid synth clones ever made, proving that you don't need the original to capture lightning in a bottle.
This is a fully analog monophonic synthesizer and sequencer built around a single voltage-controlled oscillator feeding into a four-pole diode lowpass filter with resonance that can get genuinely gnarly. The front panel mirrors the TB-303's layout with an endless encoder for tempo, waveform selector for sawtooth and square, and the essential knobs for cutoff, resonance, decay, and accent. You get two envelope generators, MIDI in/out/thru via both DIN and USB, plus CV and gate outputs that make it equally at home controlling modular gear or being sequenced by external hardware. The sequencer stores 128 banks of tracks and 64 banks of patterns in onboard memory with no battery backup needed, and you can sync everything via MIDI, DIN sync, or CV clock.
The x0xb0x earned its reputation by sounding remarkably close to the original 303 while adding modern conveniences like easier programming, USB connectivity for firmware updates, and rock-solid MIDI implementation. Builders and owners consistently praise its deep bass character and that signature acid squelch, though some note the resonance can thin out the low end at higher settings, a quirk shared with the original. It's become a staple for anyone serious about acid house production or anyone who wants authentic TB-303 character without the five-figure price tag or maintenance headaches of vintage gear.
