Ableton Live - 5.0 Bedienerhandbuch PDF herunterladen (Seite 301)

20.3. OPERATOR 299

The LFO offers a choice of classic LFO waveforms, sample and hold (S&H), and noise.

Sample and hold uses random numbers chosen at the rate of the LFO, creating the random

steps useful for typical retro-futuristic sci- sounds. The noise waveform is simply band-

pass-ltered noise.

Tip: FM synthesis can be used to create fantastic percussion sounds, and using the LFO

with the noise waveform is the key to great hi-hats and snares.

The frequency of the LFO is determined by the LFO Rate control in the shell, as well as the

low/high setting of the adjacent LFO Range switch. The frequency of the LFO can follow

note pitch, be xed or be set to something in between. This is dened by the Rate<Key

parameter in the LFO's display.

The intensity of the LFO is set by the LFO Mod control in the shell. This parameter can be

modulated by note velocity via the display's Amt<Vel control. The LFO's intensity is also

affected by its envelope.

20.3.4 Envelopes

Operator has seven envelopes: one for each oscillator, a lter envelope, a pitch envelope

and an envelope for the LFO. All envelopes are constructed similarly and feature some

special looping modes.

An envelope's shape is dened by six parameters: three rates and three levels. A rate is the

time it takes to go from one level to the next. For instance, a typical pad sound starts with

the initial level -inf dB (which is silence), moves with an attack rate to its peak level, moves

from there to the sustain level with a decay rate, and then nally, after note-off occurs,

back to -inf dB at the release rate. Operator's display provides a good overview of the

actual shape of any particular envelope and lets you directly adjust the curve by clicking and

dragging.

Hint: Envelope shapes can be copied and pasted from one place to another in Operator

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Ableton Live - 5.0 Bedienerhandbuch Seite 301