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Rise and Fall Time Ranges
Switch Position
Slider
Range
(total env.
time)
Slow
3 min. to
Slow
Med
1.5 sec.
Fast
Slow
20 sec. to
Med
Med
18Hz
Fast
Slow
2.5Hz to
Fast
Med
800Hz
Fast
Because of its analog nature, the maximum and minimum rise and fall times vary from unit to unit. The
table above shows typical values.
Note that the switch positions have little effect on the range obtained by using CV. This is intentional, to
allow external modules control over the full range.
Creating Envelopes (Trigger, Cycle, Follow)
There are four ways to generate an envelope with the 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
occur while the envelope is rising and are ignored.
Triggering with RETRIG Jumper On
Figure 3 shows how the RETRIG
jumper changes the behavior.
Regardless of what stage the
envelope is in, a trigger always resets
it to zero and begins rising. The sharp
transition to 0V can cause a click
when used with audio, so the jumper
is not installed by default.
Max Range
Use Cases
with CV
(total env.
time)
Gradual, slow fades or modulation changes
~30 min. to
occurring over the course of a long time.
300Hz
Generally suited for typical musical tempos. Useful
~30 min. to
for making notes, from snappy percussive sounds to
1kHz
long decays. The slower slider settings approach
LFO ranges.
Good for FM, AM or other audio-rate modulation.
~30 min. to
Snappy attacks and sharp decays.
8kHz
Figure 2: RETRIG jumper off.
Triggers on rise stage have no
effect. Triggers on fall stage switch
to rising.
Page
7
of
12
Figure 1: Trigger jack pulse width
does not change Env output.
Figure 3: RETRIG jumper installed.
Triggers always restart the envelope.
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