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4ms Dual EnvVCA

The Dual EnvVCA is a two-channel analog linear envelope generator with two fully independent low-noise exponential VCAs. With time ranges from 30 minutes to 8kHz, it can be used as an LFO, slew limiter, ASR/ADSR complex EG, audio-rate oscillator, stereo audio/CV VCA, envelope follower, sidechain processor, and general utility module. The outputs can be attenuated, inverted, and offset without disrupting the VCA, making it a versatile modulation source.

100% analog

Dual EnvVCA features:

  • Versatile linear envelope generator/LFO
  • Low-noise, low-distortion, DC-coupled exponential VCAs
  • 100% analog
  • Sliders and Range switches control Rise and Fall times from ~1.25ms to ~5 min.
  • Time CV jack extends time range: ~125µs (8kHz) to ~30 min.
  • Independent attenuverters for Rise and Fall time
  • Blue/Red LEDs indicate strength and polarity
  • Cycle buttons for looping envelopes (LFO)
  • Trigger input jacks fire a one-shot envelope
  • Cycle gate input jack toggles cycling for both channels
  • EOR/F (End of Rise/Fall) gate outputs can be used to chain and sequence events
  • Env Level and Offset knobs scale and shift Env Out without changing VCA volume
  • Audio In and Out jacks for passing audio or CV through the VCA
  • VCA CV inputs to use VCAs independently from the envelopes:
    • VCA gain internally connected to envelope output when VCA CV jack is left unpatched
  • Follow input jacks allow for slew limiting, sustain (ASR), and exotic filtering effects
  • Re-trig jumpers allow for re-triggering during rise phase

The Dual EnvVCA is essentially a Shaped Dual EnvVCA without the waveshaping abilities, ASR trigger mode, or extra 5V envelope outputs.

Dual EnvVCA

  • 16HP Eurorack format module
    • 0.95” (24mm) maximum depth (includes power cable)
    • 10-pin Eurorack power header
  • Power consumption
    • +12V: 156mA
    • -12V: 131mA
  • Audio/VCA
    • 100k input impedance, 1k output impedance, DC-coupled
    • VCA gain range: -90dB to +0.9dB
    • DC to 20kHz, +/-0.1dB
    • VCA response to CV: exponential
  • Envelope Times
    • Minimum rise or fall time: ~62us per segment (8kHz max frequency)
    • Maximum rise time: >10 minutes (typically > 13 minutes)
    • Maximum fall time: >20 minutes (typically > 40 minutes)
  • Jacks:
    • Env jack: Min = -10.2V, Max = +10.1V
, maximum amplitude 9.3Vpp
    • Trigger jack: rising edge threshold = 2.5V
    • Cycle jack: rising edge threshold = 2.5V
    • Follow jack: active range = 0V to +5V
    • EO* jacks:
      • EOR (channel A): <80mV low to >4.50V high gate output
      • EOF (channel B): <80mV low to >4.95V high gate output
      • Minimum stable pulse width: 1ms. Shorter than this may produce extra 50µs pulses
    • Audio In/Out jacks: -10V to +10V maximum range without clipping

Tags: 4ms , Dual , Env , VCA