Justifier is a desktop application for exploring just intonation. Build soundscapes by layering voices tuned to JI ratios from a reference frequency, tweaking parameters, and hearing the result in real time. Every parameter is visible and tweakable — you learn what is possible by experimenting.

Sound

• 12 waveform types — sine, triangle, saw, square, pulse, white/pink/brown noise, FM synthesis, and three flavors of LF noise
• Just intonation ratios — set numerator and denominator per voice, octave selector, detune in cents
• 32-voice polyphony — lock-free audio engine, zero allocation on the audio thread

Per-Voice Controls

• Amplitude & pan
• Multi-mode filter — lowpass, highpass, bandpass, notch with cutoff and resonance
• ADSR envelope — attack, decay, sustain, release
• Reverb send — stereo bus with Faust Zita Rev1 reverb
• FM synthesis — mod ratio and mod index
• Wave groups — organize voices into named, colored columns

Get It

Free and open source.

Source on GitHub · AGPL-3.0