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4ms EnvVCA User Manual

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The EnvVCA is an analog envelope generator, slew limiter, and VCA.
EnvVCA features:
• Versatile linear envelope generator/LFO
• Low-noise, low-distortion, DC-coupled exponential VCA
• 100% analog
• Sliders, switches and Time CV jack controls Rise and Fall times
• 125µs (8kHz) to over 30 minutes
• With sliders and switches only: ~1.25ms (800Hz) to over 2 minutes
• Independent attenuverters for Rise and Fall time
• Blue/red LEDs indicate strength and polarity
• Cycle button for looping envelopes (LFO)
• Trigger input jack fires a one-shot envelope
• Cycle gate input jack toggles cycling
• EOR (End of Rise) gate output can be used to chain and sequence events
• Env Level slider controls output level of the Env jack without changing the VCA volume
• Audio In and Out jacks for passing audio or CV through the VCA
• VCA gain internally connected to envelope output
• Follow input jack allows for slew limiting, sustain (ASR), and exotic filtering effects
• Re-trig jumper allows for re-triggering during rise phase
EnvVCA
4ms Company
User Manual 1.0 – August 22, 2022

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  • Page 1 EnvVCA 4ms Company User Manual 1.0 – August 22, 2022 The EnvVCA is an analog envelope generator, slew limiter, and VCA. EnvVCA features: • Versatile linear envelope generator/LFO • Low-noise, low-distortion, DC-coupled exponential VCA • 100% analog • Sliders, switches and Time CV jack controls Rise and Fall times •...

  • Page 2: Table Of Contents

    Setting up your EnvVCA 1. Power off your Eurorack system. 2. On the back of the EnvVCA you will see a 10-pin header. The 10-pin header connects to a Eurorack power header using the included power cable. Connect the 16-pin end of the power cable to a 16-pin Eurorack...

  • Page 3: Controls And Jacks

    Controls and Jacks Cycle Button, LED and Cycle Jack The Cycle button toggles the cycling state. When cycling, the EnvVCA behaves like an LFO, with an output waveform that continuously rises and falls. The Cycle button illuminates orange to indicate the module is cycling. Note that pressing this button does not reset or alter an envelope that’s already rising or falling.
  • Page 4 Env Jack The Env jack outputs the envelope. The level (amplitude) is attenuated by the Env. Level slider. Env. Level Slider The Env. Level slider attenuates the envelope output on the Env jack. When the slider is at the bottommost position, the Env jack will output 0V. In the topmost position, the Env.

  • Page 5: Patch: Making Notes

    When the slider is all the way down, you should have no modulation. EnvVCA Making Notes Using External Triggers So far in this patch, the tempo of notes has been linked to the rise and fall times of the Slow envelopes.

  • Page 6: Patch: Ratcheting

    Time CV Now whenever the clock divider’s /8 output From clock Trigger fires, the EnvVCA will cycle for the duration divider output of the gate at a rate set by the Rise/Fall CV knobs. (undivided)

  • Page 7: Rise And Fall Time Ranges

    Creating Envelopes (Trigger, Cycle, Follow) There are four ways to generate an envelope with the EnvVCA: using the Trigger jack, the Cycle button, the Cycle jack, or the Follow jack. The Trigger jack starts an envelope when it receives a trigger. It only responds to rising edges, that is, when the voltage rises through 2V.

  • Page 8: Cycle Button/Jack

    Note that the first pulse in Figure 5 does not stop the envelopes, and the three rapid pulses in Figure 4 only cause one envelope. This illustrates an important aspect of the EnvVCA: the state of the Cycle jack and button only matter when the envelope is stopped (at 0V). Any combination of gates and button presses while the envelope is running have no effect;...

  • Page 9: Fundamentals Of The Follow Jack

    Trigger jack, the envelope would start to fall once the peak is reached and we would have To mixer/ no sustain. However, if the gate at the Follow input is still output amp EnvVCA high, the envelope will remain high, creating the sustain Page...

  • Page 10: Adsr Envelope

    Follow jack goes low, the envelope will fall back to output amp zero during the “release” stage. EnvVCA We now have control over the attack or rise speed (Rise slider/switch), sustain length (gate pulse width), and sustain level (gate attenuator). However the decay time and the release time will always be the same, set by the Fall slider/switch.

  • Page 11: Audio Filter

    VCO, you can adjust the tuning with the Env Level slider. Keep in mind that the EnvVCA is not designed to be a precision portamento effect, so tuning will not be accurate over a wide range.

  • Page 12: Retrig Jumper

    RETRIG Jumper The RETRIG jumper on the back of the module changes the EnvVCA’s behavior when it receives a trigger while an envelope is already running. When the jumper is not installed (factory default), triggers received as the envelope is rising will be ignored, and triggers received while the envelope is falling will make it begin rising again from its current voltage.

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