3.5 Filter Envelope
The filter envelope modulates the filter cutoff fre-
quency and thus the timbre of the sound. Many sounds
start with a bright timbre and then decay to a darker
tone. This behavior can be modeled with the filter
envelope. The depth of the effect is controlled with
the ENV knob in the filter section. The filter envelope
has the same shape as the modulation envelope (see
fig. 3.6).
Attack
Decay
Release
Time
Level
Key pressed
Key released
Sustain
Figure 3.6: The filter envelope.
ATTACK
The ATTACK parameter specifies the duration it
takes for the envelope to reach its maximum value.
Most sounds use a setting near the minimum in order
to start bright.
DECAY
After reaching the peak, the decay stage commences.
During the decay stage, the envelope falls back to a
lower level, the sustain level.
The DECAY control
specifies the duration of the decay stage, i.e. how long
it takes to fall back to the sustain level.
SUSTAIN
This parameter specifies the sustain level that is
reached after the decay stage ends. The sustain stage
lasts as long as a key is pressed.
RELEASE
The final release stage is triggered whenever a key is
released. The RELEASE parameter specifies the du-
ration it takes the envelope to hit zero. Note that
when SUSTAIN is set to zero, the RELEASE param-
eter may have no effect if the envelope has previously
reached zero already.
14
Antidote User’s Manual
Summary of Contents for Antidot
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