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b.
Tone
Parameters
The Tone
Parameters
are
roughly divided
into
seven
blocks as
shown
below.
Please study
what
each Parameter can
do
with the
Tone
Parameter
Table.
DCO
Bloc
k^
HPF
Block
N
/
VCF
Block
N
/
®
VGA
Block
N
1^
®
Chorus
Block
Output
k
^
^
f
,
L
,
i
L
(D
LFO
Block
ENV
Block
MIDI
IN
®
DCO
(Digitally
Controlled
Oscillator)
DCO
is
the
digitally
controlled
oscillator
that
con-
trols
the
pitch
and
generates the
waveforms
that
are the
sound
source
of
the synthesizer.
(2)
HPF
(High
Pass
Filter)
The HPF
(High-Pass
Filter)
is
a
filter
that
passes
high
frequency
harmonics and
cuts
off
the
lower
ones. This
changes
the
waveform and
controls the
tone
color.
(3)
VCF
(Voltage Controlled
Filter)
Each
VCF
lets
lower frequency
harmonics
of
the
input
signal
pass
and
cuts
off
the higher ones.
In
other
words,
it
is
a
usual
low pass
filter.
By
con-
trolling
the
cutoff
point
and
resonance, the
waveform
changes, thereby
the
tone
color
alters.
®
VCA
(Voltage Controlled
Amplifier)
After
filtered
in
the
VCF,
the
signal
is
fed
to
the
VCA
where
the
volume
(amplitude) of the
sound
is
controlled
by
the
signal
from
the
ENV
Block or
Gate
signal.
(D
CHORUS
®
LFO (Low
Frequency
Oscillator)
This
oscillator
generates extermely
low
frequency,
so produces
a vibrato or
growl
effect
by
control-
ling
the
DCO
or
VCF.
@
ENV
(Envelope Generator)
This generates the
control
voltage (Envelope)
which
controls
the
DCO,
VCF
and VCA,
therefore,
alters
the
pitch,
tone
color
and volume
in
each
note.
25
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