Propellerhead Reason - 1.0.1 Manual de Operações descarregar pdf (Página 112)

SUBTRACTOR SYNTHESIZER

110

Envelopes - General

Envelope generators are used to control several important sound parame-

ters in analog synthesizers, such as pitch, volume, filter frequency etc. Enve-

lopes govern how these parameters should respond over time - from the

moment a note is struck to the moment it is released.

Standard synthesizer envelope generators have four parameters; Attack,

Decay, Sustain and Release (ADSR).

There are three envelope generators in the Subtractor, one for volume, one

for the Filter 1 frequency, and one modulation envelope which has selectable

modulation destinations.

The ADSR envelope parameters.

Attack

When you play a note on your keyboard, the envelope is triggered. This

means it starts rising from zero to the maximum value. How long this should

take, depends on the Attack setting. If the Attack is set to “0”, the maximum

value is reached instantly. If this value is raised, it will take time before the

maximum value is reached.

For example, if the Attack value is raised and the envelope is controlling the

filter frequency, the filter frequency will gradually rise up to a point each time

a key is pressed, like an “auto-wha” effect.

Decay

After the maximum value has been reached, the value starts to drop. How

long this should take is governed by the Decay parameter.

If you wanted to emulate the volume envelope of a note played on a piano for

example, the Attack should be set to “0” and the Decay parameter should be

set to a medium value, so that the volume gradually decreases down to si-

lence, even if you keep holding the key down. Should you want the decay to

drop to some other value than zero, you use the Sustain parameter.

Sustain

The Sustain parameter determines the level the envelope should rest at, af-

ter the Decay. If you set Sustain to full level, the Decay setting is of no impor-

tance since the volume of the sound is never lowered.

If you wanted to emulate the volume envelope of an organ, you theoretically

only really need to use the Sustain parameter set to full level, as a basic or-

gan volume envelope instantly goes to the maximum level (Attack “0”) and

stays there (Decay “0”), until the key is released and the sound instantly

stops (Release “0”).

But often a combination of Decay and Sustain is used to generate envelopes

that rise up to the maximum value, then gradually decreases to finally land to

rest on a level somewhere in-between zero and maximum. Note that Sustain

represents a level, whereas the other envelope parameters represent times.

Release

Finally, we have the Release parameter. This works just like the Decay pa-

rameter, except it determines the time it takes for the value to fall back to

zero after releasing the key.

Amplifier Envelope

The Amplifier Envelope is used to adjust how the volume of the sound should

change from the time you press a key until the key is released. By setting up

a volume envelope you sculpt the sound’s basic shape with the four Amplifier

Envelope parameters, Attack, Decay, Sustain and Release. This determines

the basic character of the sound (soft, long, short etc.).

Attack

(time)

Decay

(time)

Sustain

(level)

Release

(time)

Key Down

Key Up

Level

Time

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