Dave Smith Instruments Prophet REV2 Mode D'emploi page 58

—Sets a delay between the time the envelope is triggered
Delay: 0...127
(note on) and when the attack portion actually begins.
—Sets the attack time of the envelope. The higher the
Attack: 0...127
knob to the level set by the
cutoff
attacks.
—Sets the decay time of the envelope. After a sound
Decay: 0...127
controls how
decay
knob. The higher the setting, the longer the decay. Percussive
sustain
sounds, such as synth bass, typically have shorter decays (and a generous
Sustain: 0...127
long as a note is held on the keyboard.
—Sets the release time of the envelope. This controls
Release: 0...127
sound over time by giving you control over its attack, decay, sustain, and
release stages (plus a delay parameter to delay the onset of the envelope).
in designing a sound.
Without a volume envelope, the volume of a sound wouldn't change
over the duration of a note. It would begin immediately, remain at its full
volume for the duration of the note, then end immediately when the note
was released. Again, that's not very interesting sonically and it's not typi-
cally how instruments behave in the real world.
Prophet Rev2 User's Guide 25