Korg POLYSIX Owner's Manual page 8

The VCF is perhaps the single most
expressive module in the Polysix. Its basic
function
is to modify the tonal quality
(timbre) of the waveforms produced by
the
VCQs by eliminating
certain har-
monics
overtones) and
emphasizing
other ones, Understanding
how to' use it
is a key part of getting the most from
your instrument.
There are 6 VCFs in the Polysix, one
per voice. Each VCF
js a 4 pole, 24
dB/octave
low pass filter with voltage
controlled
cutoff frequency, variable re-
sponance,
positive and
negative EG
modulation
("enveloping''), and variable.
keyboard tracking.
Each of these terms
will be explained in detail below.
1) CUTOFF
The cutoff frequency is the point in
the audio spectrum where the filter starts
to affect sounds passing through it. The
Polysix filters are termed Low Pass,
which means that they pass frequencies
Which are lower than the cutoff point
Any frequencies above the cutoff fre-
quency
of the filter are
progressively
rolled off, or reduced in level. The higher
a frequency is above the cutoff point, the
more
it gets rolled off. This rolloff can
oecur
at different fates. The Polysix
filters have a 24 dB/octave rolloff. This
means
that a harmonic an octave above
the cutoff point would be about 16 times
softer coming out of the filter than going
in, At two octaves above the cutoff paint,
a harmonic would be about 250 times
softer! This very sharp rolloff helps to
Produce edlistic
imitations of most
instruments,
a wide variety of punchy
synth voicings, and many special effects.
Since the cutoff point can be varied
throughout
the audio spectrum, you can
choose to remove
na harmonics, upper
harmonics only, everything
but the
fundamental, or anything in between. It
can also remove everything, silencing the
instrument, if the cutoff point goes much
below the fundamental pitch.
j dient
Klang
glerfeld gewahlten Grun
rbe fir die im
wunschten
Ce réglage ajuste le timbre c
fondamentales cho dans le
d'oscillateurs VCO.
ondes
bloc
VCF
KBD TRACK
2) RESONANCE
2) RESONANCE
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