E-Mu Planet Phatt, Руководство по эксплуатации

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Planet Phatt Operation Manual 40
PROGRAMMING BASICS
ENVELOPE GENERATORS
An envelope can be described as a “contour” which can be used to
shape the sound in some way over time. Each channel of the Planet
Phatt contains two envelope generators. One of the envelope genera-
tors, the Alternate Volume Envelope, controls the volume of the
primary or secondary instrument over time and has 5 stages, Attack,
Hold, Decay, Sustain, and Release. The other envelope, the Auxiliary
Envelope, can be routed to any realtime control destination and is a
general purpose envelope. The Auxiliary Envelope has 6 stages: Delay,
Attack, Hold, Decay, Sustain, and Release. The time of each stage can
be adjusted to create myriad envelope shapes, which in turn shape the
sound. The Envelope parameters can be described as follows:
• Delay
The time between when a key is played and when the attack
phase begins.
•␣ Attack
The time it takes to go from zero to the peak (full) level.
•␣ Hold
The time the envelope will stay at the peak level before starting
the decay phase.
•␣ Decay
The time it takes the envelope to go from the peak level to the
sustain level.
•␣ Sustain
The level at which the envelope remains as long as a key is held
down.
•␣ Release
The time it takes the envelope to fall to the zero level after the
key is released.
Percussion
Organ
String
Plucked
••• The generalized envelope
shapes of a few types of
sounds are shown above.
D
e
l
a
y
level
time
key
down
A
t
t
a
c
k
H
o
l
d
D
e
c
a
y
Sustain
R
e
l
e
a
s
e
key
released
••• Long release times can
increase the incidence of
“channel ripoff”. If you are
running out of voice
channels, try reducing the
volume envelope release
time.