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Chapter 5: Virus Indigo Tutorials 47

4 Click memory location 1, “LFO Waveforms”

and press the Spacebar to begin playback.

In this example, LFO 1 modulates the pitch of

the oscillators.

You can use the LFOs to modulate many other

parameters, such as the pulse width of square

waves generated by oscillators 1 and 2. Pulse

width modulation adds thickness and anima-

tion to square-wave based timbres.

To hear LFO pulse width modulation:

1 Click memory location 2, “Pulse Width Mod.”

2 Press the Spacebar to begin playback.

3 During playback, watch the PW 1+2 control.

LFOs are also commonly used to modulate fil-

ters, producing a wah-wah-type effect. Filter Res-

onance and Cutoff settings greatly influence the

intensity of the effect.

To hear LFO filter modulation:

1 Click memory location 3, “LFO Filter Mod”

and press the Spacebar to begin playback.

2 During playback, watch the filter 1 and filter 2

controls, which are linked.

You can use the Key Follow control to vary LFO

rate according to MIDI note number. Playing

higher notes increases LFO speed. Playing lower

notes decreases LFO speed.

To hear how Key Follow affects LFO rate:

1 Click memory location 4, “Pan Mod Key Fol-

low” and press the Spacebar to begin playback.

2 During playback, watch the filter 1 and filter 2

controls, which are linked.

In this example, LFO 2 modulates panning of a

stereo patch. Panning speed increases with

higher notes and decreases with lower notes.

Try modulating other parameters with the LFOs.

Experiment with different waveshapes for some

surprising effects.

Synchronizing LFO Clock to MIDI

Beat Clock

You can synchronize the clock of the LFOs, Ar-

peggiator, and Delay to MIDI Beat Clock for

rhythmic consistency with other MIDI Beat-

based elements in a session.

If multiple Virus Indigo plug-ins share the same

DSP, MIDI Beat Clock must be routed to the first

instance of the plug-in. The other instances will

then also use the MIDI Beat Clock. Once MIDI

Beat Clock has been enabled, Virus Indigo will

automatically turn off its internal tempo gener-

ator.

You can route LFO modulation to virtually

any Virus Indigo parameter using the Mod-

Matrix page.

You can use MIDI Beat Clock tempos rang-

ing from 63–190 with Virus Indigo. Tem-

pos outside this range will cause timing er-

rors.

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