Ableton Live - 5.0 Bedienerhandbuch PDF herunterladen (Seite 299)

20.3. OPERATOR 297

the (PC) /

Ctrl

(Mac) context menu.

Aliasing distortion is a common side effect of all digital synthesis and is the result of the

nite sample rate and precision of digital systems. It mostly occurs at high frequencies. FM

synthesis is especially likely to produce this kind of effect, since one can easily create sounds

with lots of high harmonics. This also means that more complex oscillator waveforms, such

as Saw32, tend to be more sensitive to aliasing than pure sine waves. Aliasing is a two-

fold beast: A bit of it can be exactly what is needed to create a cool sound, and a bit too

much can make the timbre unplayable, as the perception of pitch is lost when high notes

suddenly fold back into arbitrary pitches. The Tone parameter in the global section allows

for controlling aliasing. Its effect is sometimes similar to a low-pass lter, but this depends

on the nature of the sound itself and cannot generally be predicted. If you want to familiarize

yourself with the sound of aliasing, turn Tone up fully and play a few very high notes. You

will most likely notice that some notes sound completely different from other notes. Now,

turn Tone down and the effect will be reduced, but the sound will be less bright.

The frequency of an oscillator can be adjusted in the shell with its Coarse and Fine controls.

An oscillator's frequency usually follows that of played notes, but for some sounds it might

be useful to set one or more oscillators to xed frequencies. This can be done for each

individual oscillator by activating the Fixed option. This allows the creation of sounds in

which only the timbre will vary when different notes are played, but the tuning will stay the

same. Fixed Mode would be useful, for example, in creating live drum sounds. Fixed Mode

also allows producing very low frequencies down to 0.1 Hz. Note that when Fixed Mode is

active, the frequency of the oscillator is controlled in the shell with the Frequency (Freq) and

Multiplier (Multi) controls.

Operator includes a special Osc<Vel control for each oscillator that allows altering frequency

as a function of velocity. This feature can be very useful when working with sequenced

sounds in which the velocity of each note can be adjusted carefully. Part of this functionality

is the adjacent quantize control. If this control is activated, the frequency will only move in

whole numbers, just as if the Coarse control were being manually adjusted. If quantize is

not activated, the frequency will be shifted in an unquantized manner, leading to detuned

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Ableton Live - 5.0 Bedienerhandbuch Seite 299