HPF
(HJflh P«b Firtar)
This filter lets the high frequency harmonics
pass and cuts off the low frequency harmo-
nics. As this ftiter is not voltage controlled.
Cutoff Point is changed by only moving the
knob.
14
©FREQ •Cutoff Frequency knob
This knob sets the Cutoff point of the HPF.
In its lowest position, the DCO output passes
the filter unchanged. As you raise the knob,
Cutoff point will be boosted and only the
higher harmonics are passed.
VCF
(Vottape Controlled Filter)
This filter changes the tone color by cutting
off or emphasizing harmonics. This filter lets
the low frequency harmonics pass and cuts off
the high frequency harmonics, and is con-
trolled by avoltage.
(2) FREQ •Cutoff Frequency knob
This knob is to change the Cutoff Point of the
VCF. As you lower the knob, the frequency
in the high pitch range will be cut off, and the
sound will fade out when the waveform be-
comes nearest to a Sine Wave.
»n^=? +RefertoP.15
(3) RES «Resonance knob
This control emphasizes the Cutoff Point set
by Cutoff Frequency knob 2.As you raise
the knob, certain harmonics are emphasized
and the created sound will become more
unusual more electronic in nature. If you alter
the Cutoff Frequency knob while the Reso-
nance knob is set to ahigh level, you can
create atype of sound that is attainable only
from asynthesizer, if you raise the Resonance
knob up to the maximum, the VCF will start
Self Oscillation.
(§) ENV •Envelope Modulation knob
When the Cutoff Point of the VCF is being
modulated by the output of the Envelope
Generator, this knob is used to adjust the
intensity of the modulation. You can change
the Cutoff Point of the VCF in each note with
the ADSR pattern previously set. So the
tone color of one note can be changed quite
drastically.
(5) Polarity switch
This is the selector switch for the polarity
of the Envelope. When it is set at reverse
polarity, the ADSR pattern will be reversed
and the tone color alteration will be the other
way round.
*This often means the Cutoff Frequency of
the VCF (HPF) will need to be set higher.
©LFO •LFO Modulation knob
When the Cutoff Point of the VCF is being
modulated by the output CV of the LFO,
this knob adjusts the depth of the growl or
wan effects.
®KYBD •Key follow knob
When the Cutoff Point is being controlled
by the KYBD-CV (Keyboard control voltage),
this knob adjusts the level of the KYBD-CV.
It prevents any inconsistency in the harmonic
content caused by pitch alteration. Conse-
quently this knob is usually set to the maxi-
mum on such along keyboard, but can be set
to your taste.
NOTE
*The Self-oscillation of the VCF does not
gurantee an accurate pitch. Therefore, you
cannot expect acorrect scale when playing
the keyboard.
*If using the VCF Self-oscillation as asound
source, its pitch may turn out unstable.
In such acase, move the position of the
FREQ knob until you get astable pitch.
(If you store it into memory and use it
later, its pitch will be stable.)