4ms EnvVCA Manuel de l'utilisateur - Page 13

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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.

Page

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.