Mixer; Filter - Access VIRUS|POWERCORE User's Reference Manual

The Virus also has a sub-oscillator, which is used to add extra bass to a sound by tracking the
pitch of oscillator 1, only 1 octave lower.
In addition to the 3 oscillators and sub-oscillator, there is also a noise generator. This gener-
ates 'white' noise, which sounds rather like the noise a television makes when you unplug the
aerial. This is useful for creating snare drum sounds, sound FX such as wind or surf, or simply
for adding warmth to the sound.
As if this wasn't enough, the Virus PowerCore is also capable of ring modulation (ring mod)
and FM (frequency modulation), both of which can be used to add extra harmonics and over-
tones, useful for creating more complex timbres like bells and electric pianos.

Mixer

This is where the outputs of
the oscillators, noise, and
ring modulator are balanced
before the resulting mixture is
sent to the filter section.

Filter

This is an extremely important stage of any subtractive syn-
thesizer, and the Virus PowerCore is no exception to this
with it's dual filters, each of which can be assigned to one of
4 different types.
A filter is used to remove certain components (frequencies)
of a sound, whilst allowing others to pass freely. For
instance, a lowpass filter will remove all the frequencies above a user-definable 'cutoff' fre-
quency, whilst all those below will pass - geddit? The cutoff can be adjusted in realtime,
which results in a 'filter sweep' - the life-blood of many famous synth sounds.
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