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386 Chapter 24 Sculpture
The two Sample&Hold waveform settings output random values. A random value is
selected at regular intervals, defined by the LFO rate. A modulation of Pitch leads to the
effect commonly referred to as a “random pitch pattern generator” or “sample and
hold”. Check out very high notes, at very high rates and high intensities—you’ll
recognize this well-known effect from hundreds of science fiction movies! If the
Sample&Hold with Lag setting is used, the random wave is delayed, resulting in a “fluid”
changing of values.
The term “Sample & Hold” (abbreviation—S & H) refers to the procedure of taking
“samples” from a noise signal at regular intervals. The voltage values of these “samples”
are then “held” until the next sample is taken. When converting analog audio signals
into digital signals, a similar procedure takes place: Samples of the voltage of the
analog audio signal are taken at the rate of the sampling frequency.
Rate
The Rate knob determines the rate of LFO modulation, which can be either synced to
the current song tempo or set independently in Hz (Hertz) values.
• In “Hz” mode, the rates range from DC (Direct Current) to 100 Hz.
• In “sync” mode, rates range from a periodic duration of 32 bars through to speeds of
1/64-triplets. Triolic and punctuated values are also possible.
The LFO’s are ideally suited for rhythmic effects which retain perfect synchronicity even
during tempo changes to the song.
Sync/Free Buttons
Part of the Rate parameter, these buttons allow you to select either synchronized or
free-running LFO rates. When toggling between modes the value is derived from the
song tempo and meter.
Curve
Allows you to define a freely-variable number of waveform variations, resulting in
subtle/drastic changes to your modulation waveforms.
The Curve parameter can even influence the Sine waveform type.
• Curve value of 0.0—pure sine wave
• Curve values above 0.0—wave is smoothly changed into a nearly rectangular wave.
• Curve values below 0.0—the slope at the zero crossing is reduced, resulting in
shorter soft pulses to +1 and −1.
Note: The waveform displayed between the Curve knob and the Waveform pull-down
menu shows the results of these two parameter settings.
Envelope
A simple LFO envelope control that allows either;
• constant modulation
• a ramping up to the full amount