4ms Shaped Dual EnvVCA, Руководство пользователя

Страница: 16 / 24

Creating Envelopes with Trig Jack and Switch, Cycle Button, and Follow Jack
There are several ways to generate an envelope with the Shaped
Dual EnvVCA: using the Trig jack and switch, pressing the Cycle
button or using the Follow jack.
Triggering With Switch Set To AR
When the switch is set to AR, the Trig jack starts an envelope when it
receives a trigger or gate. It only responds to rising edges. 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 Switch Set to ASR
An ASR (attack-sustain-release) envelope is trapezoidal, with a rising
slope (attack), a flat plateau (sustain), and a falling slope (release).
See Figure 2. The width of the sustain stage is controlled by the width
of the gate input, the longer a gate is held high, the longer the sustain
stage. If the gate input goes low before the rise stage completes, there
will be no sustain, as the first pulse in Figure 2 illustrates.
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 3 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 4 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 and Triggering With Switch Set To Cycle
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.
When the Trig switch is set to Cycle , a high gate on the Trig jack
toggles the cycling state. This works in tandem with the Cycle button.
If a channel’s button is initially off, a gate signal at the Trig 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
Trig jack and Cycle button causes the envelopes to cycle. Note that
envelopes generated when the Trig switch is set to Cycle do not have
a sustain portion.
In Figure 5 , the Cycle button is initially off, and the incoming gate
signal on the Trig 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 channel outputs more cycles.
Page of 16 24
Figure 1: AR – Trigger width does
not change Env output.
Figure 3: RETRIG jumper off.
Triggers on rise stage have no
effect. Triggers on fall stage switch
to rising.
Figure 4: RETRIG jumper installed.
Triggers always restart the envelope.
Figure 2: ASR – Trigger width
controls sustain length