About the VC ADSR 121


  • Controls for Attack, Decay and Release envelope phases along with the Sustain level
  • Controls for the Attack, Decay and Release response shapes from exponential, through linear to logarithmic.
  • Time range selection switch x1 / x10
  • Gate input for full ADSR output
  • Manual gate button
  • LED indicator of gate pulse integrated into the manual gate button
  • Trig input for full AR envelope from a trigger pulse
  • The Trig input can also be used for re-triggering the attack / decay phases whilst the gate input is active
  • CV inputs for each of the Attack, Decay and Release times
  • A common CV input that sets simultaneously the Attack, Decay and Release times
  • CV input for the Sustain level


  • Supply voltage +/-12Vdc
  • Supply current +31mA / -34mA
  • Output level 0-10V
  • Main PCB dimensions 87.5x130mm
  • Typical delay times (note shape and external VC control can allow these values to be exceeded)
Short Time Mode      
  Min 50% Max
Attack 3mS 12mS 1S
Decay 6mS 35mS 3S
Release 7mS 40mS 3S
ADSR 16mS 90mS 7S
Long Time Mode      
  Min 50% Max
Attack 30mS 120mS 12S
Decay 60mS 350mS 25S
Release 70mS 400mS 30S
ADSR 160mS 900mS 57S


  • Main PCB dimensions 43.5x154.85mm

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