noise-engineering-fractio-solum

Noise Engineering Fractio Solum

CV-controlled fractional clock divider and multiplier

4 HP Eurorack module

Fractio Solum is a CV-controlled clock divider and multiplier that outputs rhythmic fractions of an input clock, displayed as an intuitive ratio (e.g. 3/4 means 3 triggers out for every 4 in). It excels at generating polyrhythms, polymeter, and unusual time signatures with musical precision. The module includes x2 and /2 outputs, a BOC (beginning of cycle) trigger, mute, and reset for complex rhythmic patching.

Features

  • CV-controlled clock division and multiplication via fractional ratios
  • Intuitive two-digit ratio display showing Out/In fraction
  • Three ratio subsets selectable via 1-23-N/M switch: integer-only, powers-of-2-and-3, and full N/M table
  • Encoder for manual ratio selection
  • Ratio CV input accepting 0-5V for voltage control of ratio
  • Mute function on all outputs via encoder press, phase-preserving
  • RST input for resetting the clock cycle to the beginning
  • Out jack at selected ratio
  • x2 output at twice the selected ratio rate
  • /2 output at half the selected ratio rate
  • BOC output fires a trigger at the beginning of each cycle based on the /2 output (Out completes two cycles per BOC pulse)
  • Trigger inputs respond to signals over +2V

Controls & Jacks (14)

  • RST— Reset input. Resets the clock cycle to the beginning.
  • BOC— Beginning of Cycle trigger output. Fires at the start of each clock cycle.
  • Ratio— Sets the division/multiplication ratio. Press to mute/unmute all outputs while keeping time and phase.
  • Ratio CV— CV input for ratio control. Expects positive voltage 0v to +5v.
  • /2— Clock output at half the rate of Out.
  • x2— Clock output at twice the rate of Out.
  • Out— Clock output based on ratio. Outputs triggers at about +5v.
  • In— Clock input. Triggers from any signal over +2v.
  • Solum
  • W/N-E2-T
  • Mode— Selects ratio subset: 1 (1/x or x/1), 23 (factors of 2 or 3 only), or N/M (any fraction up to 10/10).
  • 1-23-N/M— Selects ratio subset: 1 (1/x or x/1), 23 (factors of 2 or 3 only), or N/M (any fraction up to 10/10).
  • Ratio (press/mute)— Pressing the Ratio encoder activates mute on all outputs; pressing again unmutes while keeping clock in time and phase
  • Ratio CV input— CV input for ratio control. Expects positive voltage 0v to +5v.

How-To Guides

  • Simple Clock Division
  • Clock Multiplication for Rapid Subdivisions
  • Classic Polyrhythm with Two Voices
  • Polymetric Sequence Looping
  • CV-Modulated Meter Changes
  • Poly-Polyrhythm with Two Fractio Solum
  • Rhythmic Envelope Modulation
  • Tap Tempo Master Clock
  • Preset Ratio Recall via Voltage Sequencer
  • In-Time Mute for Live Performance

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

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