make-noise-function

Make Noise Function

Single-channel analog computer for musical voltage functions

8 HP Eurorack module

FUNCTION is a single-channel analog computer from the MATHS family, capable of generating voltage-controlled envelopes, LFOs, clocks, lag processors, sample-and-hold, and much more. Its continuously variable response curve (log through linear to hyper-exponential), dedicated Hang input, and both EOR and EOC outputs give it a musical flexibility far beyond a typical envelope generator. It is a direct descendant of MATHS, distilled into 8HP with inverted and non-inverted outputs for simultaneous opposing modulation.

Features

  • Single-channel descendent of MATHS sharing the same core analog circuit
  • Continuously variable Vari-Response curve from logarithmic through linear to exponential to hyper-exponential
  • Dedicated Hang input to freeze the function mid-cycle for S&H, T&H, staircase LFO, and clock run/stop
  • Both EOR and EOC outputs (0V or 10V) for complex function chaining and clock/logic applications
  • Non-Inverted and Inverted buffered signal outputs capable of driving a 4-way multiple
  • Independent Rise CV input (linear) and Fall CV input (linear)
  • Both CV input (bi-polar exponential) affecting total time with inverted polarity response vs Rise/Fall CV
  • Cycle button with LED for self-oscillation as LFO, clock, or VCO
  • Direct coupled Signal Input for lag, portamento, S&H, T&H, and ASR envelopes
  • Trigger Input for envelope, pulse delay, clock division, and LFO reset
  • Output range 0-8V when cycling; follows input amplitude otherwise
  • EOR/EOC bi-color LED indicator (Red = EOC High, Green = EOR High)

Controls & Jacks (17)

  • Signal Input— Direct coupled input to circuit. Use for Lag, Portamento, S&H, T&H and ASR envelopes.
  • Trigger Input— Gate or Pulse applied to trigger the circuit regardless of Signal Input activity. Results in 0V to 8V function/envelope whose characteristic
  • Cycle LED— Indicates whether Cycle is On or Off.
  • Cycle— Button that causes the circuit to self-cycle, generating a repeating voltage function (LFO). Use for LFO, Clock, VCO.
  • Rise— Sets the time it takes for the voltage function to ramp up. CW rotation increases Rise Time.
  • Hang Input— Gate or Pulse applied to this input stops the circuit dead in its tracks. Use for programming S&H, Track and Hold, Stepped Functions, Steppe
  • Fall— Sets the time it takes for the voltage function to ramp down. CW rotation increases Fall Time.
  • Rise CV Input— Linear control signal input for Rise parameter. Positive signals increase Rise Time. Negative signals decrease Rise Time with respect to the
  • Fall CV Input— Linear control signal input for Fall parameter. Positive signals increase Fall Time. Negative signals decrease Fall Time with respect to the
  • Vari-Response— Sets the response curve of the voltage function. Continuously variable from Logarithmic through Linear to Exponential to Hyper-Exponential.
  • Both CV Input— Bi-Polar Exponential control signal input for entire FUNCTION. Positive control signals decrease total time while Negative control signals i
  • Activity— LED indicates activity within the circuit.
  • Non-Inverted Output— Non-inverted signal from the FUNCTION circuit. Buffered and capable of accurately driving a 4-way multiple. 0-8V when Cycling. Otherwise fol
  • EOR/EOC— Indicates the states of the EOR and EOC outputs. Red when EOC is High and EOR is Low. Green when EOR is High and EOC is Low.
  • End Of Rise Output— Goes high at the end of the Rise portion of the function. 0V or 10V output.
  • End Of Cycle Output— Goes high at the end of the Cycle (or Falling) portion of the function. 0V or 10V output.
  • Inverted Output— Inverted signal from the FUNCTION circuit. Buffered and capable of accurately driving a 4-way multiple. 0-8V when Cycling. Otherwise mirrors

How-To Guides

  • ASR Envelope (Attack / Sustain / Release)
  • Voltage Controlled Triangle LFO
  • Voltage Controlled Pulse / Clock Output
  • Sample and Hold
  • Track and Hold
  • VC Lag / Slew / Portamento
  • Independent Expo/Log Contour via Self-Patching
  • Staircase LFO
  • Voltage Controlled Pulse Delay
  • Voltage Controlled Clock Divider
  • Voltage Controlled Attack/Decay Envelope
  • Envelope Follower / Peak Detector

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

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