Noise Engineering Basimilus Iteritas

Six-oscillator digital drum synthesis with folding.

12 HP Eurorack module

A parameterized digital drum synthesizer built around six oscillators, noise, envelopes, and an infinifolder.

Features

• Six oscillators with adjustable waveform, harmonic spread, decay, and attack including noise are summed into an infinifolder.
• Variable sample rate tracks the fundamental oscillator frequency, aligning aliasing with the drum tone's harmonic structure.

Controls & Jacks (20)

• Spread— Controls frequency spacing among the oscillators, from harmonic to inharmonic overtone relationships, and scales Spread CV.
• Fold— Controls the infinifold threshold for the lower three quarters of its range; the top quarter mixes in a signal-derived pulse train for addit
• Attack— Sets attack for all oscillators and scales Attack CV; left of center adds noise, center produces an analog-style pop, and right of center sl
• Pitch CV— 1 V/oct input for the fundamental oscillator pitch; summed with the Pitch control.
• Attack CV— CV input for the attack of all oscillators; scaled by the Attack control.
• Decay CV— CV input for the decay of all oscillators; scaled by the Decay control.
• Decay— Sets the decay of all oscillators and scales the Decay CV input.
• Harmonic— Controls harmonic decay: fully counterclockwise leaves one oscillator audible, while increasing it brings in and extends additional harmonic
• Morph CV— CV input controlling the waveform blend of all oscillators; scaled by the Morph control.
• Morph— Continuously blends every oscillator waveform through sine, triangle, saw, and square, and scales Morph CV.
• Fold CV— CV input controlling the infinifold section; scaled by the Fold control.
• Skin/Metal— Selects the six-oscillator additive Skin algorithm or the six-oscillator FM Metal algorithm.
• Trigger— Rising-edge trigger input that starts a drum sound; threshold is approximately 3 V.
• Spread CV— CV input controlling oscillator frequency spacing; scaled by the Spread control.
• Harmonic CV— CV input controlling harmonic decay and the number and duration of audible harmonics; scaled by the Harmonic control.
• Pitch— Sets the fundamental oscillator pitch and sums with the 1 V/oct Pitch CV input.
• Out— Low-impedance audio output, approximately ±9 V, with level varying by parameter settings.
• Bass/Treble— Offsets fundamental pitches into a range suited to cymbal and hi-hat sounds.
• Hit— Manually triggers a drum sound.
• Status Indicator— Front-panel indicator above the Skin/Metal switch.

Explore the interactive Basimilus Iteritas panel on BleepDex — tap any control to learn what it does.