3.6 Amplitude Envelope
Located next to the Filter envelope, the amplitude
envelope controls the progression of the volume of a
sound (see fig. 3.7). It works in the same manner as
the filter and modulation envelopes.
Attack
Decay
Release
Time
Level
Key pressed
Key released
Sustain
Figure 3.7: The amplitude envelope.
ATTACK
The ATTACK parameter specifies the duration it
takes for the amplitude envelope to go from zero to
its maximum level, with a linear slope.
DECAY
The DECAY parameter specifies the duration of the
decay stage, i.e. how long it takes the amplitude 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.
3.7 LFOs
Using oscillators, the filter unit and envelopes, it is
possible to control the basic properties of a sound, such
as timbre, volume and pitch. For many bass and per-
cussive sounds this is enough to get good results, but
for pad or lead type sounds, the sustain stage may still
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