instruo-cnoc

Instruo Cnōc

Compact analogue function generator with AR, ASR, and looping modes

4 HP Eurorack module

The Instruo Cnōc is a fully analogue voltage-controlled two-stage function generator in just 4HP. Descended from the West Coast synthesis tradition, it goes well beyond a simple envelope generator. It can serve as an AR or ASR envelope, a looping LFO (from ~0.05Hz to ~1kHz), a delayed gate generator, or a slew limiter for adding portamento to pitch sequences. Dual outputs provide both bipolar (±5V) and unipolar positive (0–10V) signals simultaneously.

Features

  • Fully analogue voltage-controlled two-stage function generator
  • AR, ASR, and Looping envelope modes via 3-position toggle
  • Bipolar (±5V, 10Vpp) and unipolar positive (0–10V) simultaneous outputs
  • End-of-cycle (EOC) trigger output for chaining and sequencing
  • Assignable gate output follows either Attack or Release stage
  • Linear or logarithmic/exponential response curve selection
  • External CV control over Attack and Release parameters
  • Manual trigger button with soft sync charge direction control
  • Looping mode cycles from ~1ms (~1kHz) to ~20s (~0.05Hz)
  • Functions as envelope generator, LFO, delayed gate, or slew limiter

Controls & Jacks (13)

  • Bipolar Output— Bipolar CV output. Range: 10Vpp.
  • Unipolar Positive Output— Unipolar positive CV output. Range: 0V to 10V.
  • EOC Output— Outputs a 1ms trigger at the end of each cycle. Output voltage: 10V.
  • Gate Output— Gate signal during Attack or Release stage (set by Stage Gate toggle). Output voltage: 10V.
  • Trigger— Manually triggers the function and controls soft sync of charge direction.
  • Stage Gate— Selects whether Gate output follows the Attack stage or the Release stage.
  • Response Curve— Left: linear response curve. Right: logarithmic attack / exponential release.
  • Attack— Sets the onset duration of the function. Higher = longer attack time. LED illuminates with ascending voltage.
  • Release— Sets the return-to-start duration after attack completes. Higher = longer release. LED illuminates with descending voltage.
  • Attack CV Input— Bipolar CV input for Attack parameter. Summed with fader position.
  • Release CV Input— Bipolar CV input for Release parameter. Summed with fader position.
  • Mode— Left: ASR (Attack/Sustain/Release). Center: AR (Attack/Release). Right: Looping (~1ms to ~20s cycle).
  • Signal Input— Bipolar input for function generation. Accepts trigger, gate, or CV (in ASR mode for slew limiting).

How-To Guides

  • West Coast Synth Voice
  • CV Slew Limiter / Portamento
  • Quadrature Modulation (Two Cnōc Modules)

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

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