HPF
(HJflh
P«b Firtar)
This
filter
lets the
high frequency
harmonics
pass and
cuts off the low
frequency
harmo-
nics.
As this f
titer
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 a voltage.
(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
a
high
level,
you can
create
a
type of
sound
that is attainable
only
from a
synthesizer,
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
a
long 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
a
correct scale
when
playing
the keyboard.
*
If
using the VCF Self-oscillation
as a
sound
source,
its
pitch may turn out
unstable.
In
such a
case, move the position
of
the
FREQ
knob
until you get a
stable
pitch.
(If
you store
it into memory
and
use it
later,
its pitch
will
be
stable.)
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