{High
Pass Filter)
This filter lets the high frequency harmonics
pass
and cuts off the iow frequency har-
monics. As this fitter is not voltage controlled,
Cutoff
Point
is
changed
by
only moving the
knob.
©
Cutoff Frequency
Knob
This knob sets the Cutoff point of the HPF.
With
this set to 1,
the DCO output passes the
filter unprocessed, and as it is raised, Cutoff
point
is
heightened, higher harmonics being
passed. In the
meantime,
at its
lowest posi-
tion
"0",
lower frequencies are boosted.
(This is
specially useful
for
boosting
bass
sound
of organ, etc.)
(Voltage
Controlled Filter)
This filter changes
the tone
color
by
cutting
off
or emphasizing harmonics. This filter lets the
iow frequency harmonics
pass and cuts
off
the high frequency , and is controlled by a vol-
tage.
ENV
LFO KYBD
-10
©
'3J
(2)
FREQ
•
Cutoff Frequency Knob
This knob is
to
change
the Cutoff Point of the
VCF. As
you
lower
the knob,
higher
frequen-
cy will
be cut off, and
the
sound will fade
out when the waveform becomes nearest
to
Sine Wave.
(3)
RES
•
Resonance Knob
This control emphasizes the Cutoff Point set
by Cutoff Frequency knob
©.
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 Resonance
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 its self
oscillation.
<4j
When
the Cutoff Point of the VCF is being
modulated by the output of the Envelope
Generator,
this knob is used to adjust the in-
tensity 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 within
one note can be changed quite
drastically.
(5)
F
This is the selector
switch for the polarity
of
the Envelope.
When it is set at reverse polar-
ity,
the
ADSR
pattern will be reversed and the
tone
color
alteration will be the other way
round.
&.i (4j (7!
®
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 grow!
or
wah
ef-
fect.
®
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 pre-
vents any inconsistency in the harmonic con-
tent caused
by
pitch alteration. Consequently
this knob is usually
set to the
maximum on
such a long keyboard, but can be
set
to your
taste.
The self-oscillation of the VCF
does
not
guarantee
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,
since the Cutoff frequency does not
change
continuously. In such
a case,
change the
position of
the
FREQ Knob
(2)
unitit you get
a stable pitch. (If you write it into memory
once and recall it, the pitch will
be
stable)
The factory
preprogrammed
patches A-
31
,
58, and 82, and B-21,
27,
28, 35, 36,
66,
72, 75 and
85 use the sound
soufce
created by the VCF self-oscillation.
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