Make Noise Contour
Expressive 4-stage envelope with vari-response shaping
8 HP Eurorack module
The Make Noise Contour is a 4-stage function generator derived from the 0-COAST synthesizer, inspired by the original MiniMoog Loudness Contour circuit. It generates Attack-Decay-Sustain-Release style envelopes with a shared Decay and Release time, and features a Vari-Response control that continuously shapes the envelope curve from linear to exponential. Its Mirrored Output and EON/EOC gate outputs enable complex patch chaining, crossfading, LFO generation, and clock division within a Eurorack system.
Features
- 4-stage ADSR-style function generator with shared Decay and Release time
- Vari-Response control: continuously variable from linear to exponential curve shaping
- Mirrored (inverted) Output starts at maximum and falls as Contour rises, ideal for crossfading
- EON (End of Onset) gate output goes high after Onset completes and low after Decay completes
- EOC (End of Contour) gate output goes high during Onset and whenever Contour is not active
- Self-cycling LFO mode by patching EOC to Gate Input
- Sustain Overdrive: Sustain above 3:00 pushes maximum level above 8V up to 10V peak-to-peak
- Onset and Decay independently voltage-controllable via dedicated CV inputs
- Contour Output buffered for driving 4-way multiples
- Mirrored Output buffered for driving 4-way multiples
- EON and EOC outputs: 0V or 10V gate signals
- Re-triggerable during Decay phase when Sustain is set to minimum (AD mode)
Controls & Jacks (14)
- Gate Input — Accepts any signal above 1.5V to initiate the envelope. Gate width determines sustain duration in ADSR and ASR modes. Also accepts clock sig
- Onset — Sets the time it takes for the voltage function to ramp up to maximum level. Clockwise rotation increases Onset Time. Range determines attac
- Onset CV Input — Linear CV input for the Onset parameter. Positive voltage increases onset time; negative decreases it relative to the knob. Extends range be
- Sustain — Sets the voltage level held while gate is high, and determines envelope type. Fully CCW gives AD (no sustain); up to 3 o'clock gives ADSR; a
- Decay — Sets the time for both the Decay and Release stages. Fully CCW is very fast; CW lengthens both decay and release together. In LFO mode, cont
- Decay CV Input — Linear CV input for the Decay parameter. Positive voltage increases both decay and release times; negative decreases them. Extends range bey
- EON — One color of the bicolor LED. Lights when the End of Onset output is high, indicating the onset phase has completed and the envelope is in d
- Vari-Response — Shapes the envelope curve from linear (CCW) to exponential (CW). Also affects overall speed; exponential settings produce faster, snappier e
- EON Out — Gate output (0V or 10V) that goes high when the Onset phase ends and stays high until Decay completes. Useful for event chaining, delayed tr
- Enter LED — Indicates activity at the Contour Output. Brightness follows the envelope voltage; dim at rest and bright at peak. In LFO mode, pulses rhyth
- EOC — Second color of the bicolor LED. Lights when End of Contour output is high, indicating the module is in the Onset phase or is idle.
- EOC Out — Gate output (0V or 10V) that goes high during the Onset phase and whenever the contour is idle. Patch to Gate Input for self-cycling LFO mod
- Enter — Inverted (mirrored) version of the Contour signal. Starts high when Contour is at 0V and moves inversely. Buffered for driving multiples. Id
- Contour Output — Main envelope CV output, typically 0-8V (up to 10V in Sustain Overdrive). Buffered for accurately driving a 4-way multiple. Use for VCA cont
How-To Guides
- Classic ADSR Amplitude Envelope
- Self-Cycling Triangle LFO
- Gate-Controlled Crossfader
- Gate-Controlled Switch via EON and EOC
- Vactrol-Free Bongo / Percussion
- Sidechain Ducking
- Voltage Controlled Clock Divider
- Slow Linear Filter Sweep LFO
- Gate Delay and Event Chaining
- Exponential FM Modulation Envelope
Explore the interactive Contour panel on BleepDex — tap any control to learn what it does.
