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At
0,
there
is
no
resonance,
and
fre-
quencies above
the cutoff point are
rolled
off
smoothly. Chainging
the cutoff point
with
no
resonance
simply
varies
the
brightness or high
frequency content
of
the
sound.
Advancing
the
Resonance
control
clockwise
(towards
higher
numbers)
creates
a
resonant
"peak" which
serves
to
strongly
emphasize
the frequencies near
the cutoff point (frequencies
above
the
cutoff
point are
still
rolled
off).
This
results
in
much
more
dramatic changes
to
the timbre
of the
sound.
Medium
reso-
nance produces
the
characteristic
"waa-
waa"
sound
when
the
filter
cutoff
is
swept
by
the
EG.
footpedal
or
manually.
At
high resonance,
the
filter
will
self-
oscillate,
producing
a
pure
sine
wave
at
the cutoff frequency. This
can be used
as
a
second sound
source along
with
the
VCO,
or
by
itself
if
the
VCO
is
shut
off.
The
purest
tone
is
generated
at
about
7.
KBD TRACK
This controls the
degree
to
which
the
filter
"tracks" the
keyboard, over
a
range
of
0%
to
150%. Keyboard
tracking
is
an
extremely
useful
function
in
which
the
VCF
is
made
to
"follow"
the
note
as
it is
played
on
the
keyboard.
This
produces
more
even
and
realistic
sounds
by
insuring that the tonal
quality (timbre) of
a given
sound remains
consistent over the
full
5
octave
range
(100%
tracking).
Without keyboard
tracking, a given
sound
played
at
"C" would
sound
bright
and
buzzy
at
the lowest
"C", and
muted
or
even non-existent
at
the
highest
"C".
The
VCF
also
allows
deliberate
over-
or
under-tracking.
This
produces
smooth
and
controlled
tone
quality
changes
as
you
move
up and
down
the
keyboard,
for special effects,
or
to
simu-
late
instruments with changing timbres
(e.g.,
many
orchestral
and keyboard
in-
struments).
At
settings of
100%.
the
VCF
follows the
note
on
a
1
for
1
basis.
At
25%
or
50%
VCF
in
effect "lags
behind"
the note
played;
this
causes notes to
sound
brighter
as
you
go up
in
pitch
and
darker
as
you
go
down
in
pitch,
and
rounder
or
mellower
as
you
ascend.
Conversely,
at
150%
VCF
cutoff increases
"faster" than
does
the
keyboard
pitch,
which
causes notes to
sound
brighter as
you
go up
in
pitch
and
darker
as
you
go
down.
When
the
VCFs
are
self-oscillated
and
used
as
sound
sources, the
KBD TRACK
control
allows
you
to
"play"
the
filters
from
the
keyboard
(100%
track-
ing).
Additionally,
special scales
known
as
Microtonal
(e.g.,
"quartertone")
and
Macrotonal can be
created
at settings
less
than, or greater
than
100%,
respectively.
Variable
keyboard
tracking
is
ex-
tremely
useful
in
producing
realistic
in-
strumental
sounds,
and
in
helping
to
make
any
particular
program sound good
over
a
full
five
octave
range.
O
EG INTENSITY
This controls
how much
the cutoff
frequency
is
varied
by
the
EG.
It
also
determines whether
the
filter
is
swept
u\:
(positive
modulation)
or
down
(negative
modulation)
during
the attack
phase o
-
'
the
EG.
Maximum
sweep depth
is
plus or
minus 10
octaves.
Wide sweep
depths
arc-
usually associated
with dramatic
effects,
"electronic"
lead
and
bass
sounds,
clav
type sounds,
etc.
Small
sweep
depths
are
often used
to
add
a subtle
extra
dimen-
sion to
more
"natural"
sounds
like
french
horn,
woodwinds
and
other
orchestra!
sounds.
However,
there are certainly no
hard
and
fast
rules
and
anything
tha:
sounds
good
to
you
should
be
used
freely.
An
external
control
voltage
(MS-01
pedal,
etc.)
may
be
applied
to
VCF
fcM
IN
jack
(nominal
sensitivity
is
1V
octave).
3)
VCF EG
This
envelope generator modulates
the
VCF
cutoff
frequency
so
that
there
is
a
variation
in
tone
color
according
to
the
shape
of the
envelope.
See
VCA
EG
for
details
about each knob's
function.
Also
refer
to
setting
charts
for
examples
of
applications.
3)
VCF EG
Dieser Hiillkurvengenerator
moduliert
die
VCF-Grenzfrequenz
so. dais sich die
Klangfarbe
gemafs
der
Hullkurvenform
andert.
Einzelheiten
Liber
die
Funktion
der einzelnen Regler erfahren
Sie
unter
VCA
EG.
Lesen
Sie
auch
die
Einstell-
tabellen
fur
Anwendungsbeispiele.
3)
VCF EG
Ce
generateur d'envejoppe
module
le
frequence
de coupure
du
VCF
de
sorte
qu'il se
produit
une
variation
du
timbre
suivant
la
forme de
I'enveloppe.
Voi'
VCA
EG
pour
avoir
tous
les
details
concernant
la
fonction de
chaque
poten-
tiometre.
Se
referer
egalement
aux
dia-
grammes
de
reglage
fournis
commeexem-
ples
duplications.
1
HHLUHH
m
1
VCF EG
»
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4
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1
-
m
a
2
-
Mm
-
8
2 -
-
8
MM
-
8
,
*W
9
,
W
W
9
,
w*
„
,
m
w
9
O
10
10
10
10
ATTACK
DECAY
SUSTAIN
RELEASE
10
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