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Chapter 20 ES2 235
Note: An interesting effect you may wish to try out is achieved by modulating Pitch123
with a suitable modulation intensity that leads to an interval of a fifth. Choose the
upper rectangular wave to do so.
Sample & Hold
The two lower waveform settings of the LFOs output random values. A random value is
selected at regular intervals, defined by the LFO rate. The upper waveform delivers
exact steps of randomization. At its lower setting, the random wave is smoothed out,
resulting in fluid changes to 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.
∏ Tip: A random modulation of Pitch123 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!
Rate (LFO 2)
The LFO2 Rate (frequency) control allows for the free (in the upper half of the slider
range) or project-tempo synchronized (in the lower half of the slider range) running of
LFO 2. The rate is displayed in Hertz or rhythmic values, dependent on whether the
project tempo synchronization is engaged or not. Rates range from speeds of 1/64-
notes through to a periodic duration of 32 bars. Triolic and punctuated values are also
possible. LFO 2 is ideally suited for rhythmic effects which retain perfect synchronicity,
even during tempo changes to the project.