Korg POLY-800 Owner's Manual page 17

3 . 4 . 5 V C F ' .
The Voltage Controlled Filter (VCF) controls tonal quality (tim-
bre) by selectively removing and emphasizing different over-
tones of the DC0 waveforms. The VCF used in the Poly-800
Frequency and reduces or removes completely the overtones
ABOVE rhe Cutoff Frequency. When RESONANCE is turn-
ed up, any overtones very close to rhe Cutoff Frequency will
be emphaslzed.
Cutoff Frequency is the most imponant parameter of the VCF
Varying the Cutoff Frequency changes the blend of overtones.
resulting In a timbre change (which helps create dynamic and
"lifelike" sounds). Cutoff Frequency is determined by the
CUTOFF ('-: : ). KBD TRACK ( '-:3 ). POLARITY
EG INT( L;S parameters. It can be also be affected by DEG
3 and/or by the Modulation Generator (MG).
PARAMETER NAMES AND FUNCTIONS
CUTOFF
This parameter directly sets the Cutoff Frequency of
the low pass filter.
KBDTRACK (1'3) and EG INT(SS) ares6lto 2).
all wavelorm overtones from lhe DCOs are passed
without any effect. and the sound Is very brighl.
,
are cut off, producing a more rounded or less bright
sound.
When the Cutoff Frequency Value is near
all of the waveform is filtered out. resulting in almost
no sound.
RESONANCE
Resonance emphasizes Ihe harmonics near the Cutoff
Frequency, producing a characteristic "wah" or "band
pass" type of sound.
and
The higher Ihe Value, the stronger the effect of the
Filler on the tonal quality (timbre). Resonance can prc-
make instrumental sounds more real&tic. and general-
ly provides a good variety of subtle and dramatic
Effect on tone
Large (very pesky sound)
Keyboard Tracking controls how the VCF Cutoff Fre-
keyboard. There are three Values: Full. Half and Off.
Full ( z )
SOUND SYNTHESIS
Harmonics near
Value
Small
None
Cutoff Frequenq rises and falls in EXACT
PROPORTION to the pitch of the HIGH-
EST note sounding at any given time
(whether played on Ihe keyboard or ptc+
This tends to keep timbre (tonal quality)
relatively constant as you play up and
down the keyboard.