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RING
MODULATOR -NOISE
GENERATOR -AUDIO
MIXER
RING
MODULATOR
The
RING
MODULATOR
is
used mainly
for
metallic
sounds
like
bells
and
gongs,
and
for
unrealistic effects
sounds.
The
RING
MODULATOR
has
two
inputs; the
output
is
the
sum
and
difference frequencies of
the
two
inputs.
The two
input
frequencies,
then,
determine
the
qualities
of the
output
sound.
1.
VCO-2/EXT
SIG
SWITCH
One
input to the
RING
MODULATOR
is
the
output from
VCO-KB). The
other input
is
determined by
the position of
this
switch.
With
this
switch,
it
becomes
possible to
combine
an
external
signal
with
VCO-KB)
for
ring
modulation.
When
combining
the
two
VCO's,
the
resulting
sound
will
depend
on
the difference
in
pitch
of
the
two
VCO's.
The
tuning
of
VCO-2
is
im-
portant.
When
the
two VCO's
are
tuned
to unison, very
little
change
in
the
tone
color
will
occur,
although
the pitches
will
be
one
octave higher
than
normal.
Tuning
the
VCO's
to
different
frequencies
will
produce
the tone color charac-
teristic
of the
RING
MODULATOR.
Interesting
effects
can be obtained
using the
two
note
function of
the
keyboard,
since,
if
different
intervals are
played, the
RING
MODULATOR
will
receive
frequencies of different
ratios.
Interesting effects
can
also
be obtained with
S/H
control
of
one
or
both VCO's, and
by
varying the
amount
of
S/H
modulation
of
one
or
both VCO's.
When
using
an
external
sound
source,
it
is
important
that the
level
of the external
sound
which
reaches
the
RING
MODULATOR
be
near the
level
of
VCO-KB).
This can
be
done
by
first
setting
the
EXT
SIG
INPUT
switch
on
the
rear
panel
at
the correct
position,
then
adjusting
output
level
of the external source, or
by
changing
the distance
between
the
sound
source
and
the
microphone.
RING
MODULATOR
.
NOISE
GENERATOR
AUDIO MIXER
©
©
NOISE
GENERATOR
The
NOISE
GENERATOR
is
used
as
the
sound
source
for
effect
sounds
like
wind,
surf,
and
thunder.
To
synthesize
wind
sounds,
raise
the
VCF
RESONANCE
control
about
half
way
and
move
the
VCF CUTOFF FREQ
control slowly
up
and down. Another
way
is
to use the
output
of the
LFO
to control the
VCF
cutoff frequency.
Or, for
random wind
patterns,
use the
output
of the
S/H
set at
random.
To
synthesize thunder,
raise
the
VCF
RESO-
NANCE
control
all
the
way
up and modulate
this
with
noise.
2.
WHITE/PINK
SELECTOR
Two
types of
noise are
available:
white
noise
and
pink
noise.
White
noise
is
the
random
combination
of
all
frequencies. This kind of noise
is
like
the
hissing
sound
which can be
heard
when
an
FM
tuner
is
set at
a point
where
there
is
no
station
broad-
casting.
Pink
noise
is
similar,
but
has
some
of
the higher frequencies
filtered
out
to
produce
a
sound more
like a
waterfall.
AUDIO MIXER
This
mixer mixes outputs
of the
VCO's,
Noise
Generator,
RING
MODULATOR,
and
the
external input
signal.
3.
RING
MODULATOR/EXTERNAL
INPUT
SELECTOR
Set
this
Selector to
RING
position or to
EXT
SIG
as desired.
4.
OVERLOAD
INDICATOR
This
indicator
lights
when
the
combination
of
mixing
levels
is
excessively
high.
To
reduce
distortion
at
VCF
and
VCA,
keep
the
output
low enough
that
this
indicator
does not
light.
Pay
particular
attention to
this
indicator
when
mixing
signals
from
the
RING
MODULATOR
or external source.
12
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