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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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