Sequential Prophet Rev 2, User Manual

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28 29 Amplifier Envelope Sequential Prophet Rev2 User’s Guide Auxiliary Envelope
attack decay sustain release
amplitude
time
note off note on
delay
A typical five-stage, DADSR envelope
Delay: 0...127
—Sets a delay between the time the envelope is triggered
(note on) and when the attack portion actually begins.
Attack: 0...127
—Sets the attack time of the envelope. The higher the
setting, the slower the attack time and the longer it takes for a sound to
reach its full volume. Pads typically have softer (longer) attacks. Percus-
sive sounds have sharper (shorter) attacks.
Decay: 0...127
—Sets the decay time of the envelope. After a sound
reaches its full volume at its attack stage,
decay
controls how quickly the
sound transitions to the level set with the
sustain
control. The higher the
setting, the longer the decay. Percussive sounds, such as synth bass, typi-
cally have shorter decays.
Sustain:
0...127
—Sets the sustain level of the envelope. The higher the
setting, the louder the sustained portion of the sound will be. The sound
will stay at this level for as long as a note is held on the keyboard.
Release: 0...127
—Sets the release time of the envelope. This controls
how quickly a sound dies out after a note is released.
Pan Spread: 0...127
—Pans the audio in the stereo field individually
per voice. With a
pan spread
setting of zero, all voices are panned in the
middle (monophonic). As you turn up
pan spread
, the audio in each voice
is gradually moved away from the center by different amounts. Every
other voice goes in a different direction. This provides a wide stereo field
as you play. Any modulation to Pan will individually move each voice
from its static position as set by the
pan spread
setting.
Env Amount: 0...127
—Sets the amount of modulation from the Ampli-
fier Envelope to the VCA. In most cases you will probably want to set
this fully clockwise for maximum VCA volume. If you experience signal
clipping, try reducing the
env amount
.
To recreate the “gated VCA” effect used on certain classic rock anthems,
choose an organ sound, then set the
env amount
of the Amplifier to zero, route the LFO
square wave to
amp
with an
amount
setting of 100% and hold a few chords.
Velocity Amount:
0...127
—This enables keyboard velocity to modu-
late the VCA Envelope Amount. It doesn’t enable keyboard velocity to
directly control the VCA (loudness). To do this, see the note below.
To create a program in which velocity controls the VCA, turn vca
envelope
amount
down and turn
velocity amount
up. To achieve the best results, it may be
necessary to set an initial level using Envelope Amount. Just remember that once
Envelope Amount is set to the maximum, no modulation from velocity—or any other
source—will cause it to go higher than that.
Auxiliary Envelope
The Prophet Rev2 has an additional five-stage envelope generator. It
is useful for creating modulation that varies over time according to the
shape of the envelope. Routing an envelope to an oscillator’s frequency,
for example, causes the oscillator’s pitch to rise and fall according to the
contour of the envelope.
As with all of the Prophet Rev2’s envelopes, there are controls for modulat-
ing the envelope amount using keyboard velocity. The Auxiliary Envelope
can be routed to any of the modulation destinations in the mod matrix. In
addition, the Auxiliary Envelope can repeat (loop) using the
env
3
repeat
function in the
misc params
menu. This is useful for cyclical 4-stage modulation.
Actually, any of the Prophet Rev2’s envelopes can be routed to any destination (or
multiple destinations) using the modulation matrix. See “Modulation” on page 33 for more
information.