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Chapter 5: Virus Indigo Tutorials 45

2 During playback, watch the Sustain control

and listen to how the sound character changes.

The next stage of the amplifier envelope is deter-

mined by the Time control.

To hear the sustain time stage:

1 Click memory location 4, “Amplitude Time”

and press the Spacebar to begin playback.

2 During playback, watch the Time control and

listen to how the sound character changes.

The higher the Time setting, the faster the vol-

ume increases to its maximum level. The lower

the Time setting, the faster the volume decreases

to zero.

If Time is set to its center position of zero, the

sustain level remains constant.

The final envelope stage is determined by the

Release control.

To hear the release stage:

1 Click memory location 5, “Amplitude Re-

lease” and press the Spacebar to begin playback.

2 During playback, watch the Release control

and listen to how the sound character changes.

Release determines how quickly the volume de-

creases after you release a note. The higher the

Release value, the slower the fade out. The lower

the Release value, the faster the fade out.

By using the amplifier envelope creatively you

can simulate the amplitude characteristics of

virtually any instrument, from drums to wood-

winds and beyond.

Memory Locations 6 and 7 demonstrate how

different envelopes can radically change the

character of a patch.

To hear envelopes change sound character:

1 Click memory location 6, “Typical Amp

Envelope 1” and press the Spacebar to begin

playback.

This patch has a soft attack similar to woodwind

instruments. Next, listen to the same basic

patch, but with a different envelope.

2 Click memory location 7, “Typical Amp Enve-

lope 2” and press the Spacebar to begin play-

back.

This patch has a hard attack and fast decay, not

unlike a Japanese koto. These simple examples

should give you some idea of the sound shaping

power of the Amplifier Envelope.

Next, you’ll experiment with the Filter Enve-

lope.

Filter Envelope

The Filter Envelope controls how the filter re-

sponds each time you play a note.

The Filter Envelope varies the cutoff frequency

of both filter 1 and 2 each time you play a note.

It has the same five controls as the Amplifier En-

velope: Attack Decay, Sustain, Time, and Re-

lease.

In addition, filter 1 and 2 each have an envelope

amount (Env Amt) control. This determines the

degree to which the envelope affects filter cut-

off. The greater the envelope amount, the

greater the effect the filter envelope has on cut-

off frequency.

Memory Location 8 demonstrates all five stages

of the Filter Envelope.

If you set Sustain to its maximum level of

127, the Decay control no longer has an ef-

fect. To use decay effectively, the Sustain

level must set below its maximum.

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