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1-2
DYNAMIC LOW-PASS
FILTERS
(DLPF)
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CUT-OFF
FREQUENCY
{Fc)
adjustment
for
each
key's
indepen-
dent tow-pass
filter.
•
PEAK ADJUSTMENT
Emphasizes
resonance
at
cut-off
point.
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KEYBOARD
FILTER
BAL-
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Adjusts tho
Fc
of
each of the
key's
independent
low-pass
filters
over
a
rising or falling
slope
corresponding
to
the
scale
of the keyboard.
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EXPAND
Adjusts the degree
to
which
the
EM
envelope
signal
affects
the
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MODULATION
SWITCH
On/off
switch
for
cutoff frequency
modulation.
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INTERNAL
MODULATION
SENSITIVITY
Adjusts
depth
of
modulation from
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•
EXTERNAL
MODULATION
SENSITIVITY
Adjusts
depth
of
modulation from
external
signal.
•
CUT-OFF
MODULATION
INPUT
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For
FcM
from
external
signal.
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1-2
Dynamic
Low-pass
Filters
(DLPF)
This
section
corresponds
to the
VCF
of
a
monophonic
synthesizer.
It
processes
the
waveform
(which
is
the
primary
determi-
nant
of tone
color)
coming from
the
SG.
The
FC
knob
controls the cut-off frequen-
cy.
Since these
are
low-pass
filters,
the
harmonic
elements of
the
waveform
which
arc
higher
than
the cut-off
frequency
will
be
shaved
off,
thereby
producing
a
more
rounded
sound.
The
PEAK
knob
controls the
amount
of
emphasis
given
to
the
frequencies
right
below
the
cut-off
frequency.
In
other
words,
it
varies
the
slope steepness
(Q)
of
a
resonance
at
the cut-off
point.
Use
the
keyboard
filter
balance
(KBD F
BAD
knob
if
you want
the cut-off
fre-
quency
to
be
different for different parts
of
the
keyboard.
Each key
has
its
own
filter
(VCF),
the
cut-off
frequency of
which
can be
varied
independently;
this
knob
raises
or lowers
the
Fc
of each key
to
conform
to a
rising
or
falling
slope
corresponding
to the scale
of the
keyboard. With the
EXPAND
knob
you
can
make
the
cut-off
frequency
vary
along with the
"envelope"
(the
volume
contour) determined
by
the controls
in
the
EM
section
(Attack,
Decay,
Sustain.
Release).
Cut-off
frequency modulation
(FcM)
for
such
effects as
wow
and growl
is
controlled
in
the
same
way
as
frequency
modulation
in
the
SG
section.
Starting
from
the
normal
setting,
check out
what happens
when
you
use the controls
in
the
DLPF
section;
note
that
if
yoitturn
the
Fc
knob
all
the
way
to
"0", the
sound
may
become
so
rounded
that
it
is
inaudible.
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