Casio CZ-1000 Operation Manual page 18

)
Digital
Controlled
Wave
(DCW
1,
DCW
2)
The
Diqital
Controlled
Wave
section
corresponds
to
an
analog synthesizer's
VCF
(Voltage
Con-
trolled Filter)
The parameters
of this
section are
Key
Follow
and Envelope
Generator
parameters.
Key Follow
controls the
wave form according
to
the pitch
of the
keys being
played,
while Enve-
lope
parameters
control the
change over
time
of
the
wave form
after a
key has
been
pressed.
The Key Follow
parameter has the function of
making
the
wave form gradually
approach a pure
sine
wave
(or
cosine
wave)
the higher the pitch of the
key being pressed.
It
can be
set to
one
of
9
different levels.
(Fig.
1)
(Fig. l)
ffllfflfflli!!
[\
Approaches the sine
wave form
The chanqe
of
the
wave form
over
time
is
controlled
by
the
envelope generator.
The wave form
depends on the
momentary
value of
the envelope.
With
the
PD
system, the
change
is
performed
starting
with a
pure sine
wave and ending
with the basic
wave form
set in
the
DCO
section.
(Fig. 2)
DCW
envelope
r\f\f\
Key
OFF
Key
ON
If
one
of
the basic
resonance wave forms
I
to
III
has
been selected
in
the
DCO
section,
the
num-
ber of sine
waves
(that
is
to say,
the sine
wave
frequency) within
one
of the
window
wave forms
K
/\ r\
is
altered
between
1
and 16 according to
the
momentary
value of
the
envelope
achievinq the
same
effect
as
if
the
resonance
level
of
the
VCF
in
an analog synthesizer
had
been
raised.
This
is
very effective
when you want
to
accentuate a particular
frequency
range.
(See
Fig.
3.)
(Fig. 3)
DCW ENVELOPE
When using resonance
II
Key
ON
Key
OFF