The Modulo is D1 Synthesis' fully analog four-voice instrument for exploratory sound design. Six audio oscillators, each offering sine, triangle, square, and saw waveforms, feed a three-stage wavefolder and a 2-pole state-variable filter, giving the instrument a path from precise tones into unstable, folded, modulation-heavy textures.
Its performance surface is an illuminated one-octave buttonboard with octave selection across seven octaves, supported by 1 V/octave, gate, and velocity inputs for external control. The most distinctive part of the architecture is the modulation system: all voices feed a global FM bus that can modulate each voice, while two voices form complementary hyper-modulation pairs with mutual FM. A built-in three-band color-organ also turns the signal into trigger outputs for lamps or other analog systems.
