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A ring modulator can be created when an oscillator modulates another oscillator.
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On CS-80 V, the Ring Modulator controls are to the left of the Tone Selector
buttons. The ring modulator combines the VCO sounds with another VCO built
into it, and outputs the sum and difference of their frequencies. If the ring
modulator Speed is set very slow, it produces tremolo; if the Speed is increased,
it creates powerful and clangorous extra harmonics that are great for bells and
other metallic sounds.
There's one more sound source available on CS-80 V: Noise. Noise is a
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combination of all frequencies at the same time. When the distribution of
frequencies is equal, we call that white noise . Changing the frequency
distribution changes the color of the noise; a common alternative to white noise
is pink noise , which has more lower frequencies than higher ones and sounds
more "natural" to the human ear. Noise can also be used as a control voltage
signal to alter the behavior of other modules.
On modular synthesizers, a noise source is usually a separate module. On internally-wired
synths, noise can be a choice of one VCO's waveform, a separately mixable part of one
VCO's output, or a separate source that is mixed in later. On CS-80 V, both VCOs have a
mixable noise waveform, and the Sub Oscillator can be set to produce noise.
Arturia - User Manual CS-80 V - The Basics of Subtractive Synthesis
Ring modulation
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