4ms EnvVCA User Manual - Page 3
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Controls and Jacks
Cycle
Cycle
Slow
Fast
Rise
Fall
Slow
Med
Fast
Rise CV
Fall CV
Time CV
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
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.
The Cycle jack toggles the cycle state using a gate source. If the Cycle button
is off, a given gate signal will initiate cycling for as long as the gate is held high.
If the Cycle button is on, then the functionality is inverse and the gate signal will
cease any cycling for as long as the gate is held high. See Using the Cycle
Button for more information.
Rise/Fall Sliders
The Rise and Fall sliders control the rise and fall times of the envelope. Shifting
a slider up makes the rise or fall portion slower, and down makes it faster.
Each slider has a white light that indicates the current stage and output voltage
of the envelope. When the envelope is in the rise stage, the Rise slider light will
increase in brightness until the envelope hits its maximum. Once the peak is
reached, the Rise light will turn off and the Fall light will turn on, decreasing in
brightness as the envelope falls.
Rise/Fall Switches
The Rise/Fall switches select the overall range of the sliders. Each slider has its
own switch with three positions: Fast, Med, Slow.
When the switch is flipped to Fast, the envelopes go well into the audio range,
allowing for classic AM, FM, and other fast modulation effects.
The middle position (Med) is designed for typical musical tempos, and can be
useful when using the VCA to make notes at common BPMs.
The Slow position is geared for gradual fades and other slow LFO-style
modulations.
See the Rise and Fall Time Ranges chart on page 7 for more information.
Time CV Jack and Rise/Fall CV Knobs
The Time CV jack modulates the Rise and Fall times of the envelope. The jack
feeds two knobs: Rise CV, and Fall CV. Each of these knobs is an attenuverter
(short for "attenuating inverter") and controls how much the control voltage on
the Time CV jack will effect either the rise time or the fall time.
Turning an attenuverter knob to the right of center means that a positive voltage
on the Time CV jack will lengthen the rise/fall time and a negative voltage will
shorten the rise/fall time.
Turning a knob to the left of center gives the opposite effect, meaning that a
positive voltage on the Time CV jack will shorten the the rise/fall time, while a
negative voltage will lengthen these durations.
The farther you turn the knob from center in either direction, the more effect
incoming CV will have. When the knob is centered, the signal on the Time CV
jack will have no effect on the rise or fall time.
Next to each knob is a light which indicates the strength and polarity of the
modulation. The light will turn blue when the rise or fall time is being lengthened
by CV, and red when the time is being shortened. The brighter the light, the
more of an effect the CV is having. When the light is off, the Time CV jack has
no effect on the envelope time.
See CV Controlling Rise and Fall Times and Generating Exponential and
Logarithmic Shapes for more information.
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