Noise Engineering Basimilus Iteritas Alter

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Type LFSR VCO

Size 10HP Eurorack

Depth 1.5 Inches

Power 2x8 Eurorack

+12 mA 150 / 80 (if 5v on)

-12 mA 5 / 5

+5 mA 0 / 90 (optional)

Noise Engineering

Basimilus Iteritas Alter

Analog-inspired parameterized drum synthesizer

Basimilus Iteritas Alter is a parameterized digital drum synthesizer with its

roots in the analog world. At its heart, it is a simple six-oscillator additive

synthesizer with adjustable waveform, harmonic spread and decay. Adjustable

attack including a noise oscillator is also included. ese are summed and fed

into an innifolder for crunch and variety.

Basimilus Iteritas Alter is an improved version of Basimilus Iteritas. It is 2HP

smaller, includes CV of switches, adds an third mode, and pitch range and

knobs know oﬀset rather than attenuate.

Basimilus

Iteritas

Alter

Pitch

Spread

Harm Fold

Trig

Decay

Attack S/L/M

B/A/T

Out

Morph

Pitch

Morph

Fold

HIT

Attack

Decay

Harmonic

Skin

Liquid

Metal

Bass

Alto

Treble

Main Page

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Summary

Interface Controls

Pitch Control

Adjusts the fundamental oscillator pitch and accepts 1V/8va CV input.

Decay Control

Adjusts decay for all oscillators; knob offsets the CV input.

Attack Control

Adjusts attack; noise left of center, slows attack right of center.

Morph Control

Controls waveform blending (sine, triangle, saw, square) for all oscillators.

Fold Control

Manages the infinifold section's threshold and adds fold stages.

Harmonic Control

Adjusts harmonic decay and amplitude, adding more harmonics as increased.

Spread Control

Varies oscillator spacing from harmonic to inharmonic overtone series.

Mode Selection (Skin;Liquid;Metal)

Selects between additive synth, pitch envelope, and FM synth modes.

Range Selection (Bass;Alto;Treble)

Offsets pitch by two or four octaves relative to the Bass setting.

Trigger Input

Initiates a drum sound start with a rising-edge trigger (~3V threshold).

Hit Switch

Allows manual triggering of the Basimilus Iteritas Alter.

Audio Output

Provides a low-impedance audio source with variable loudness.

Tone Generation Explained

Variable Sample Rate

Calibration Procedures

Voltage Supply Configuration

Genesis and Design Notes

Special Thanks