E-Mu Morpheus Instruções de Operação descarregar pdf (Página 48)

Planet Phatt Operation Manual40

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.

level

time

key

down

Sustain

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.

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