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Creating Envelopes (Trigger, Cycle, Follow)
There are four ways to generate an envelope with the Dual 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.
Figure 1 shows how a long or short pulse will cause identical
envelopes since the pulse width and falling edge of the signal are
ignored.
Triggering with RETRIG Jumper Off (Factory Default)
If the envelope is already rising when a trigger is received, then the
trigger is ignored (unless the RETRIG jumper is installed). If the
envelope is falling when a trigger is received, it will begin rising from its
current voltage. Figure 2 demonstrates this: the fifth and seventh
triggers occur while the envelope is falling and cause it to begin rising
mid-fall. The rest of the triggers either occur while the envelope is
rising and are ignored, or while the envelope is not running, causing it
to start.
Triggering with RETRIG Jumper On
Figure 3 shows how the RETRIG jumper changes the behavior. With
the jumper installed, a trigger will always reset the envelope to zero
and begin rising, regardless the stage of the envelope. This sharp
transition to 0V can cause a click when used with audio, so the jumper
is not installed by default.
Cycle Button/Jack
The Cycle button is a simple way to initiate an envelope. When the
button is on, envelopes will cycle continuously. The button is latching,
so pressing it once will make the module output envelopes until you
press the button again. Once an envelope begins, pressing the Cycle
button again will not immediately stop the envelope. Instead, the
envelope will stop after finishing its fall stage.
The Cycle jack toggles the cycling state of both channels when a gate
is received. It's utilized in tandem with the Cycle buttons. If a
channel's button is initially off, a gate signal at the Cycle jack will
toggle it on. If the button is initially on, a gate at the jack will toggle it
off. The Cycle button will shine orange whenever the combination of
the Cycle jack and Cycle button causes the envelopes to cycle.
In Figure 4, the Cycle button is initially off, and the incoming gate
signal on the Cycle jack causes the envelope to cycle for as long as
the gate is high. In this case, as the pulse width of the gate signal gets wider, the Dual EnvVCA outputs
more cycles.
Figure 4: When Cycle button is off, high gate on Cycle
jack makes envelope run.
Figure 5: When Cycle button is on, high gate on Cycle
jack makes envelope stop.
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Figure 1: Trigger jack pulse width
does not change Env output.
Figure 2: RETRIG jumper off.
Triggers on rise stage have no
effect. Triggers on fall stage switch
to rising.
Figure 3: RETRIG jumper installed.
Triggers always restart the envelope.
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