basimilus-iteritas-alter

Noise Engineering Basimilus Iteritas Alter

Six-oscillator analog-inspired digital drum voice

10 HP Eurorack module

Basimilus Iteritas Alter is a parameterized digital drum voice with analog roots, built around six oscillators running in additive or FM configurations with a powerful wavefolder for harmonic shaping. It excels at kicks, snares, hats, claps, and experimental percussion but can also produce leads, basslines, and abstract textures. Its variable sample rate, per-oscillator envelopes, and three synthesis modes give it a wide sonic palette ranging from sub-shaking thuds to metallic alien noise.

Features

  • Six-oscillator synthesis engine with three architecture modes: additive, additive with pitch envelope, and phase modulation
  • Variable sample rate aligned to harmonics of the fundamental to reduce inharmonic aliasing
  • Per-oscillator envelopes controlled by Attack, Decay, and Harmonic parameters
  • Infinifold wavefolder with dynamic multi-stage folding and pulse train mixing at extreme settings
  • Dedicated noise oscillator mixed via Attack knob position
  • Harmonic decay control that individually shapes the duration of each of the six oscillators
  • Spread control for tuning oscillators from harmonic to inharmonic intervals
  • 1V/octave pitch tracking on Pitch CV input
  • Envelope output mimicking internal envelope shape for external modulation
  • Manual trigger button on front panel
  • Audio-rate triggering supported
  • Bass/Alto/Treble range switch with two-octave steps

Controls & Jacks (28)

  • Status— Indicates module power status.
  • Attack— Adjusts attack time for all oscillators. Left of center adds noise, dead center produces classic analog-style pop, right of center slows att
  • Morph— Controls waveform of all oscillators. Blends continuously through sine, triangle, saw, and square. Offsets CV input.
  • Pitch CV— Pitch modulation input. Calibrated for 1V/octave. Range: -2V to +5V.
  • Morph CV— Waveform modulation input. Knob offsets this CV. Range: 0V to +5V.
  • Harmonic CV— Harmonic decay modulation input. Range: 0V to +5V.
  • Harmonic— Controls harmonic decay of oscillators. Fully left produces only one oscillator (simple analog bass drum). Increasing adds more harmonics wi
  • Fold— Controls infinifold section. First 3/4 of range sets folder threshold with dynamic fold stages. Top quarter mixes in pulse train for additio
  • Spread— Controls frequency spacing of oscillators. Allows overtone series to vary from purely harmonic to inharmonic.
  • Decay— Adjusts decay time for all oscillators. Offsets CV input.
  • Pitch— Adjusts pitch of oscillators. Press and turn for coarse semitone adjustments, or turn for fine tuning. Calibrated for 1V/octave tracking.
  • Audio Out— Low-impedance audio output. Output varies based on parameterization with loudness compensation. Up to 14V peak-to-peak.
  • Bass/Alto/Treble— Three-position switch changing voice pitch register. Each position offsets pitch by two octaves.
  • B/A/T— Envelope output that mimics the shape of BIA's internal envelope. Range: 0V to +5V.
  • Spread CV— Harmonic spread modulation input. Range: 0V to +5V.
  • Decay CV— Decay time modulation input. Knob offsets this CV. Range: 0V to +5V.
  • Trigger— Envelope trigger input. Threshold around +1.8V. Any gate or trigger fires the envelope.
  • Fold CV— Fold/wavefolder modulation input. Knob offsets this CV. Range: 0V to +5V.
  • Skin/Liquid/Metal— Three-position switch selecting oscillator configuration. Skin: six-oscillator additive for tonal sounds. Liquid: six-oscillator additive wi
  • Attack In— Adjusts attack time for all oscillators. Left of center adds noise, dead center produces classic analog-style pop, right of center slows att
  • Activity— Indicates envelope activity.
  • Treble
  • Trig LED
  • Trig— Triggers the envelope. Manual button activates envelope. Works at audio rates and accepts any gate or trigger.
  • S/L/M cv
  • S/L/M
  • Attack CV— Attack time modulation input. Knob offsets this CV. Range: 0V to +5V.
  • Power

How-To Guides

  • Autocalibration
  • Simple Kick Drum
  • Simple Snare Drum
  • Simple Hi-Hat
  • Not Quite FM Bass
  • Supersaw Synth Lead
  • Simple Clap
  • Evolving Metallic Texture
  • Percussion as Modulation Source
  • Pitch-Modulated Kick Variations

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

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