Open Source Hardware
LOHI Bassline Junkie
A fully open-source 8-voice hardware synthesizer built for hands-on sound design, live performance, and deep experimentation. One knob per function — turn a control, hear the change, keep moving.
A fully open-source 8-voice hardware synthesizer built for hands-on sound design, live performance, and deep experimentation. One knob per function — turn a control, hear the change, keep moving.
Three oscillators per voice, flexible modulation, multimode filtering, SD card preset storage, and USB MIDI — the immediacy of a hardware instrument with the freedom of an open-source platform.
Play chords, layered textures, basslines, pads, and evolving sequences with eight independent voices of polyphony.
Each voice has three oscillators with sine, sawtooth, square, and noise waveforms. Independent tuning lets you build everything from clean tones and thick detuned stacks to noisy percussion, drones, and unstable analog-style patches.
A resonant state-variable filter offering low-pass, high-pass, and band-pass modes. Frequency, resonance, and keyboard tracking move you from warm subtractive tones to sharp, animated filter motion.
Three full ADSR envelope generators give detailed control over amplitude, filter movement, pitch, and modulation depth. Loop mode turns envelopes into extra rhythmic or cyclic modulation sources.
Three LFOs with sine, saw, square, and triangle waveforms provide free-running modulation. Use them for vibrato, tremolo, filter sweeps, drifting pitch, or slow evolving patches.
Route envelopes and LFOs to multiple destinations through the modulation matrix. Connect modulation sources to oscillator pitch, filter cutoff, and other synthesis parameters.
Store up to 512 presets on an SD card. Save your own patches, recall them instantly, back them up, and share banks with other Bassline Junkie users.
A simple 7-segment LED display keeps patch selection and navigation direct, readable, and performance-friendly.
Connect Bassline Junkie directly to your DAW, sequencer, or hardware setup over USB MIDI. Use it as a desktop module, a live performance instrument, or part of a larger MIDI-controlled rig.
Bassline Junkie is designed to be studied, modified, repaired, and extended. The hardware and software are open — for musicians, builders, hackers, and anyone who wants to reshape their instrument.
Core sound parameters have dedicated physical controls — no menu diving, no hidden pages. Oscillators, envelopes, LFOs, filter, modulation, and preset handling are laid out for fast hands-on editing.
3D renders of the Bassline Junkie enclosure. Every knob, button, and LED placed for hands-on control.
Custom PCB design in Eagle, STM32 Nucleo brain, and hand-soldered prototypes.
Source code and firmware are available on GitHub. Contributions welcome.