Arturia minibrute 2 series, Руководство пользователя

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Most importantly, other devices can control an oscillator to set its pitch (keyboard controller),
modulate its pitch (vibrato), and modulate the shape of the waveforms (PWM, Ultrasaw).
6.1.1.2. Unpitched signal generator
Unlike the previous category, an unpitched signal generator (also called noise generator)
has no regular, periodic pattern — the signal’s amplitude is always changing randomly.
Therefore, it has no fundamental frequency (hence no pitch), and its harmonic spectrum
consists of a nearly infinite number of frequencies that have no harmonic relationship.
Such signals sound very different from the pitched signals, and are like the sound of wind,
a water stream, steam exhaust, rain, waterfall, etc.
The fundamental frequencies and harmonics of sine and sawtooth
waveforms
The output of a random noise generator
Arturia - User Manual MiniBrute 2 - Basics of synthesis 42