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Access Music Virus Indigo Plug-in Guide44

When playback stops, experiment with the Fil-

ter Routing, Filter Balance, Cutoff, Resonance

and Mode controls while playing your MIDI

keyboard controller.

Load one of your favorite Virus Indigo patches

and try changing its filter routing. You’ll hear

that this can make a subtle but definite impact

on timbre.

Tutorial 4: Amplifier and Filter

Envelopes

As the name implies, the envelope generator lit-

erally gives a shape or envelope to the harmonic

content or amplitude of a sound.

Virus Indigo has two separate envelopes: an am-

plifier envelope and a filter envelope.

Amplifier Envelope

The Amplifier Envelope controls how the vol-

ume characteristics of a patch respond each time

you play a note.

There are five envelope stages: attack, decay,

sustain, sustain time, and release.

By varying these four parameters, you can

emulate a wide variety of instrumental

effects, ranging from plucked sounds to

bowed sounds, and almost anything in

between.

To hear the amplifier envelope:

1 Open the “Tutorial 4” session.

2 Record enable the Instrument track so that

you can play Virus Indigo using a MIDI key-

board controller.

3 At the upper left of the Virus Indigo plug-in,

click Filter/Env to show the envelope page.

4 Click memory location 1, “Amplitude Attack”

and press the Spacebar to begin playback.

5 During playback, watch the Attack control

and listen to how the sound character changes.

Attack controls the initial volume swell of the

sound. The higher the attack value, the longer it

takes for the sound to reach its maximum vol-

ume after the start of the note.

Next, listen to the Decay stage.

To hear the decay stage:

1 Click memory location 2, “Amplitude Decay”

and press the Spacebar to begin playback.

2 During playback, watch the Decay control

and listen to how the sound character changes.

Decay controls how quickly the volume falls

from its initial peak. The level to which the vol-

ume falls is called the sustain level. This is deter-

mined by the Sustain control.

To hear the sustain stage:

1 Click memory location 3, “Amplitude Sus-

tain” and press the Spacebar to begin playback.

Typical amplitude envelope

AMPLITUDE

attack decay

note on

sustain

sustain time

(positive)

release

TIME

note off

sustain time

(negative)

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 82 83

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