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Chapter 5: Virus Indigo Tutorials 41

Timbral character varies according to the wave-

shape of oscillator 2, its semitone interval, and

the type and amount of FM modulation applied.

Memory Location 5 demonstrates some of the

different tones that can be generated using fre-

quency modulation. Note that the Osc 1/2 Bal is

set to 63 to monitor only oscillator 2 and its FM-

based tone.

To hear examples of frequency modulation:

1 Reset the patch to its original state by choos-

ing Tutorial Sounds > Tutorial 2 Sound from the

Librarian menu.

2 Click memory location 5, “FM Timbres” and

press the Spacebar to begin playback.

3 During playback, watch the oscillator 2 Semi-

tone and FM Amount controls and listen to how

the sound character changes.

When playback stops, experiment with the

oscillator 2 Semitone, FM Amount, FM Mode,

Shape, and Sync controls while playing your

MIDI keyboard controller. You can create a wide

variety of FM-based sounds using just these few

parameters.

Tutorial 3: Filters

Filters dramatically shape a synthesizer’s sound

by attenuating the harmonic content of its tone

generators. Virus Indigo actually has two filters,

which increase its sound-shaping capabilities.

Here you’ll experiment with filter 1, starting

with its cutoff frequency.

Using Filter Cutoff

The filter Cutoff control determines the har-

monic content of a sound by selecting a fre-

quency above, below, or around which har-

monic overtones are removed.

To hear the effect of filter cutoff:

1 Open the “Tutorial 3” 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 filter page.

4 Hold down a note and rotate the filter 1 Cut-

off control.

Note how the sound becomes brighter or duller

depending on whether you raise or lower the

cutoff frequency.

The low-pass filter reduces or attenuates the

higher frequencies in an audio signal and lets

the lower frequencies pass. The frequencies

above the cutoff frequency are suppressed and

those below pass through the filter unaffected.

Changing the Filter Mode

The Mode pop-up menu selects among four dif-

ferent filter types:

LP (low-pass) Removes the higher frequencies in

a signal and lets the lower frequencies pass.

HP (high-pass) Removes the lower frequencies in

a signal and lets the higher frequencies pass.

BP (band-pass) Removes both ends of the tonal

spectrum and lets only a narrowly defined band-

width pass.

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