Yamaha CS-10 Owner's Manual page 9

FUNCTIONS
VCF
The
tone
is
created
by
effecting
control
on
the
harmonic
structure
by passing the
VCO
signals
through
a
filter.
©
HPF/BPF/LPF FILTER SWITCH
HPF:
HIGH-PASS FILTER
Frequency components
that are
higher than the
cut off
frequency
set
by means
of
CUT OFF FRQ
are passed
through
this
filter. It is
employed,
for
example,
when
cutting the
fundamental sound and
controlling the
low
frequency range.
BPF:
BANDPASS
FILTER
The
intermediate
frequency components between
the cut off frequencies are passed through
this fiher.
LPF:
LOW. PASS FILTER
Frequency components lower than the cut off
frequency
are passed
through
this
filter.
This
is
a
filter
commonly
used
for synthesizers.
(2)
CUT OFF FRQ
(Cut off
frequency)
Control
the
tone by
adjusting the
boundary
between
the portion to be passed
through
the
filter
and
that
which
is
to
be
cut off.
This changes the
harmonic
structure
of the sound
source.
The more
this
control
is
turned clockwise, the
higher the
cut
off frequency becomes.
• While
in
the
LPF
mode,
if
the
CUT OFF FRQ
control
is
turned too
far in
the counterclockwise
direction,
it
may
cause even the
fundamental
sound to be
cut off, resulting in
no sound
at
all.
(D
RESONANCE
Turning
of
this
RESONANCE
control
in
the
clockwise
direction will
cause the
harmonics
in
the
neighborhood of
the cut off frequency
to
be
empha-
sized,
thereby
giving
even stronger
characteristics
to
the tone.
®
EG-VCF
(Envelope
generator)
The
change
in
tone,
from
the instant the
key
is
depressed to the
point the sound fades out,
is
made
by
this
EG.
This
is
achieved
by
varying the
filter's
cut off
frequency with
time.
INITIAL
LEVEL
(ID
Set the
harmonic
structure for
the point the sound
starts
when
the
key
is
depressed.
The more
the con-
trol
is
turned toward the
"-5"
side,
sound
will
be
started
from
a further
lower
cut
off frequency.
ATTACK LEVEL
(AL)
The
maximum
level
up
to
which
the
harmonics
structure
is
to
be changed
is
set
by
this
control.
The
farther control
is
turned toward
the "+5''
side,
it
will
cause the
harmonic
structure to vary to
a
higher
cut
off frequency.
|)
(|)
®
-
~-
1
;
—
i
Through
resonance of the
fc,
the
harmonics
are
emphasized
fc
:
Cut
off
frequency
(D
@
KEY ON
time
©