LinPlug Organ 3 - Manual (Page 40)

Envelopes
An envelope is a time-varying signal used to control the development of
another signal after it has been triggered. Envelopes are most often used
for controlling a signal's amplitude. That’s what the envelopes of Organ 3
are for. The Envelopes of the Upper Manual, Lower Manual and Pedal
contain the following controls: Attack, Decay, Sustain, Release.
Attack: the time the sounds takes to reach the full volume after pressing
a key .
Decay: the time to fall from the Attack volume to the Sustain volume.
Sustain: the volume of the sound while keeping a key pressed.
Release: the time the sound takes to fade out after a key has been
released. This parameter can also be altered using the Release dial to
the left of each manual.
Note: to create a classical organ-envelope, the Attack-time has to be set
to minimum, Sustain to maximum and Release to minimum. With
Sustain set to maximum the Decay-time has no effect.
LinPlug Organ 3 User Guide Page 40