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Chapter 24 Sculpture 385
Each modulation generator allows you to select one (or in most cases, two) of the core
synthesis parameters as a modulation “target”. The same target can be selected for all
modulators, if desired.
Modules such as the LFOs and Control Envelopes also offer “via” modulations (a freely
modulatable amount/intensity—the scaling factor—of the modulation source output
level). These are “sidechain” modulations.
Some modulation generator parameters—for example LFO rates, can be modulated by
selecting the desired modulation “source” and amount.
To access the desired modulation generator, click on the corresponding button in this
section of the Sculpture GUI. Once a modulation source has been activated, the
corresponding button label will be lit.
LFO 1 and 2
The two full-featured LFOs 1+2 offer several possibilities that go beyond the Vibrato
LFO and Jitter generators described below.
Waveform
This pull-down menu allows you to select the waveform used for LFO modulation,
Options are: Sine, Triangle, Sawtooth, Rectangle Unipolar, Rectangle Bipolar, Sample&Hold,
Sample&Hold with Lag, Filtered Noise.
The triangular wave is well suited for vibrato effects.
The sawtooth is well suited for helicopter and “space gun” sounds. Intense modulations
of incoming frequencies leads to “bubbling and boiling, underwater” sounds. Intense
sawtooth modulations of lowpass filters create rhythmic effects.
The rectangular waves make the LFO periodically switch between two values (e. g.—a
positive value and zero—Unipolar). The Bipolar Rectangular wave switches between a
positive and a negative value set to the same amount above/below zero.