Yamaha CS-15 Owner's Manual page 12

FUNCTIONS
VCF/VCA
a®
LFOMOD
The
cut-off
frequency can be
modulated by
the
LFO. The
further
towards 10
the
knob
is
turned, the
deeper
the
modulation becomes.
)
®
EG
DEPTH
Adjust the
depth
of the envelope
set
by
the
EG
block
to
be applied to the
VCF.
•
If
the
CUT OFF FREQ
knob
is
used to control
the
tone
quality with
EG
DEPTH
in
position,
and the
EG
DEPTH
is
then deepened, some-
times
sound
will
cease to
be produced. This
will
happen
when
the
cut-off
frequency,
as
lowered
by EG, becomes
so
low
as
to cut even
the fundamentals
of the
sound
sources.
)®
EG
These
switches select the
envelope generators of
EG
1
or
EG
2.
The
ordinary envelope
wave
ys.
is
produced
in
EG
1
+ and
EG
2
+,
while
in
EG
1
-
and
EG
2
-
the
reversed
envelope
wave v-r
is
obtained.
The +
direction
of
EG
reacts to the direction
in
which
the cut-off frequency
becomes
higher.
The
VCA
blocks are voltage controlled amplifiers
which
amplify
the
signals
according
to en-
velope curves
to
change
the
volume produced by VCF.
»
<g>
INITIAL
LEVEL
Adjusts the
level (initial level)
of
the
output
vol-
ume
from
the
VCA
when
keys
are
not
depressed.
This
is
used
when
effect
sounds
are to be
produced
regard-
less
of the
keyboard
or
sounds
are
needed
for
check-
ing
purposes while
making
adjustments.
• The
output volume from
the
VCA
is
combined
from
the
levels set
by
the
INITIAL
LEVEL
knob
and the
EG
knob.
D@
LFOMOD
Modulate
the
VCA
at
a cycle
set
by
the
LFO
block
and changes volume
periodically.
The
further
towards
10 the
knobs
are
turned, the deeper
is
the
modula-
tion.
)®
EG DEPTH
Adjust
the
depth
of the
envelope
set
by
the
EG
block
to be applied to the
VCA.
&
@
EG
Select either
EG
1
or
EG
2.
Ipppf^
YAMAHA
:©....
^
r
I J
r
1
1
t
r
1
:
1
fct
© ©
Initial level
Output
level
when
no
keys
are
depressed.
r-
Total
Output
Level
V
1
+
Initial
Level
o
*
Trigger
signal.
<EY ON
KFY
ore
©