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Using Offset and Level Knobs

The Level and Offset knobs control the amplitude and DC level of the signal output from the Env Out

jacks. They do not effect the VCA or the audio signal (unless you patch Env Out to VCA CV). Being

independent of the VCA allows you to modulate something with Env Out and control the modulation

with Level and Offset without disrupting the VCA.

The Level knob controls the amplitude of the envelope. When the knob is centered, no envelope will be

output. Turning it to the right of center makes the envelope rise upward in voltage and fall downward

(this is the most common setting for an envelope). If you turn Level left of center, the envelope will be

inverted: it will rise downward and fall upward. The farther from center (in either direction) that you turn

Level, the greater the amplitude. At fully clockwise or counter-clockwise, the amplitude will be about

10V.

The Offset knob shifts the envelope output up and down. With the Offset knob in the center, the

envelope will rest at 0V and then rise to the voltage set by the Level knob (at most +10V if Level is fully

clockwise, or -10V if Level is fully counter-clockwise). If Offset is turned left of center, the envelope will

rest at a negative voltage. When Offset is fully counter-clockwise, it will rest at -10V. Going the other

way, if Offset is turned to the right of center, the envelope will rest at a positive voltage, with +10V

being the maximum.

The Env Out jacks clip at about -10V and +10V. Using Level and Offset at their extremes, you can

easily cause clipping which results in a steady -10V or +10V output (and is not typically very interesting

in a patch). If you're ever unsure where to set Level and Offset, a good starting place is to set Offset

to the center, and Level to around 3:00 or higher.

RETRIG Jumper

The RETRIG jumper on the back of the module changes the Dual 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.

When the jumper is installed, the Dual EnvVCA will immediately restart the

envelope when it receives a trigger, regardless of whether the envelope

is rising or falling. When this happens, the envelope will immediately fall

to 0V and begin to rise again. This sharp transition to 0V can cause

clicking when used with the audio VCA section.

See the Creating Envelopes section on page 13 for more details.

VCA Min Gain Trim pot

On the back of the module is a trimpot that can adjust the minimum

VCA gain. Typically, you will want to set this so that you do not

hear any audio bleeding through when the envelope is not running.

However, setting the minimum gain too quiet means that when the

Dual EnvVCA is cycling, there are longer gaps between notes.

That is, there is more time between envelope peaks where the

sound is inaudible or barely audible.

At fully counter-clockwise, the VCA will provide -90dB of

attenuation when the envelope is not cycling. This is the maximum

amount of silence between notes when cycling and minimum amount of bleed. In the middle position

(factory default), there is -80dB of attenuation. It provides a short amount of silence between envelope

cycles, and low amount of bleed. Turning the trim pot all the way clockwise provides -30dB of

attenuation when the envelope is stopped. This may be useful if you wants less silence between cycles,

and don't mind hearing some audio when the envelope is not cycling.

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