8
HPF
(High Pass
Filter)
This
filter
lets the high
frequency harmonics
pass
and cuts
off
the
low frequency harmo-
nics.
As this
filter
is
not voltage controlled.
Cutoff
Point
is
changed by only moving the
knob.
FREQ •
Cutoff
Frequency
Cutoff
Point of
HPF
can be
adjusted with
this
knob.
As
you raise this
knob,
frequencies
in the low pitch
range will be cut
off.
VCF
(Voltage
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 a
voltage.
@
FREQ • Cutoff Frequency
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.
^C^^
•>
Refer
to
P.
15
(^
RES
•
Resonance
This control
emphasizes the
Cutoff
Point set
by Cutoff FREQUENCY knob
@.
As
you
raise
the knob, certain
harmonics
are em-
phasized and
the
created
sound
will become
more
unusual
more electronic
in nature. If
you
alter the Cutoff
FREQUENCY
knob
while the
RESONANCE
is set
to
a high
level,
you can
create
a
type of
sound
that
is
attain-
able only from
a
synthesizer.
If
you raise
the
RESONANCE
up
to the
maximum,
VCF
will start Self Oscillation.
(5)
ENV
•
Envelope
Modulation
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.
(D
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.
*NOTE
This
often means the Cutoff Frequency
of
the
VCF (HPF)
will need
to
be set higher.
(6)
LFO
•
LFO Modulation
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
wah
effects.
(D
KYBD
•
Key follow
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
a
long
keyboard, but can
be set
to
your taste.
*NOTE
Self
oscillation of
the VCF
does not guarantee
accurate
pitch.
So, you cannot
obtain
correct
scale when playing the
Keyboard.
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