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Access Music Virus Indigo Plug-in Guide20

The LFO Page

The LFO page has controls for the 3 low fre-

quency oscillators. These are typically used to

modulate oscillator pitch, filter cutoff fre-

quency, pulse width, and many other parame-

ters.

LFO 1

Use the controls in the LFO 1 section to select

the waveshape, rate, characteristics, and routing

of LFO 1.

Rate Selects the rate of the LFO. Using the Clock

control overrides this control.

Clock Selects a beat-based LFO rate. Choices

range from 1/64 to 4/1. Using the Clock control

overrides the Rate control. The LFO clock can be

synchronized to MIDI Beat Clock. See “Synchro-

nizing LFO Clock to MIDI Beat Clock” on

page 47 for more information.

Shape Selects the waveshape of the low fre-

quency oscillator. Each produces a uniquely dif-

ferent effect. Choices are:

•sine

• triangle

• sawtooth

•square

• sample & hold (random)

• sample & glide (random with portamento)

• oscillator waveform number. This selects

one of the many different waveshapes

(3–64) produced by the main oscillators.

Contour Controls the phase of the triangle wave

by adjusting the ratio of length between its up

ramp and down ramp. When set to 0, the trian-

gle wave goes through its full wave cycle. At –64,

only the downward half of the wave cycle is gen-

erated, producing a downward sawtooth wave.

At +63, only the upward half of the wave cycle is

generated, producing an upward sawtooth

wave.

Env Mode When enabled, the LFO generates a

single wave cycle at the start of a note only, then

stops. Use this to generate a one-time modula-

tion envelope in the selected waveshape.

Key Follow Controls how much LFO speed is af-

fected by MIDI note number. Playing higher

notes increases LFO speed. Playing lower notes

decreases LFO speed.

Key Trig Controls the initial phase of the LFO

wave cycle when a key is played. When set to

Off, the LFO is not triggered.

LFO Mode When enabled, each voice played

triggers the LFO individually. When disabled, all

voices have the same LFO phase, making modu-

lation effects more pronounced.

LFO page

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 82 83

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