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If a VCO has a Sync control, activating it causes one VCO to synchronize with
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another. We do this because if VCO1 is synced to VCO2, then every time VCO2
starts a new wave cycle, VCO1 is forced to restart as well... and that forced restart
makes VCO1 generate a waveform that's impossible to create any other way,
with rich and complex harmonics. Changing the frequency of VCO2 causes the
shape of VCO1 to change, which produces powerful sweeping timbres with a
rough or sharp quality.
KORG MS-20 V has oscillator sync as an added option; the original MS-20 didn't
have this feature.
! Note that this is not the same kind of sync as tempo sync , where things like Sub Oscillator Speed
or Delay Time can be synced with the tempo of your song.
A ring modulator can be created when an oscillator modulates another oscillator.
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On KORG MS-20 V, Ring is one of the available settings on VCO 2. The ring
modulator combines the VCO sounds and outputs the sum and difference of
their frequencies. If one VCO's frequency is set very slow, it produces tremolo; if
the frequency is increased, it creates powerful and clangorous extra harmonics
that are great for bells and other metallic sounds.
In the case of KORG MS-20 V, ring modulation can be selected as the 'waveform'
of VCO2, and can be blended with VCO1 in the VCO Mixer.
Ring modulation: frequencies of two input sine waves and the resulting output waves.
There's one more sound source available on KORG MS-20 V: Noise. Noise is
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a 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.
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Shape and harmonic content of a sine wave
Arturia - User Manual KORG MS-20 V - The Basics of Subtractive Synthesis
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