Roland SH-1 Instruction Manual page 25

SYNTHESIZING
SOUNDS
2.
ENVELOPES
1.
Envelope Control of the
VCA
It is
the nature of the
VCO
to produce
its
waveforms continuously. Using
the Basic
Setting {opposite page), try
moving
the
VCA
HOLD
control up; the
sound
will
be
continuous whether
a
key
is
pressed or not.
With
the
normal
Basic Setting,
the
VCA
is
controlled by
means
of
an envelope
generator
to
produce sound
only
when
a
key
is
pressed.
In
the
Basic Setting, the
ENV-2 "A"
and
"R"
controls are
at
"0", thus the
sound
is
like
an electronic
organ because
it
starts
and
stops instantly.
If
the
ENV-2
controls
are
set as
shown
in
0)
at
the
right,
the
sound
will
take
on
the
shape of
a
violin
sound.
The
tone quality
will
become even
more
violin-like
if
you
use the
sawtooth
waveform
with the
RANGE
switch
set
at
4'
or 8',
Check
the
sound
with other
settings
of the
RANGE
switch,
too.
2.
Controlling the
VCA
with
ENV-1
The
sustain level
of
ENV-2
is
permanently
set at
maximum;
only the attack time
("A") and
release
time ("R") are adjustable.
To
produce envelopes such
as
shown
in (2)
and
(3),
use
ENV-1
to control the
VCA.
To
do
this,
set
the
VCA
envelope
select
switch
at
ENV-1.
{2}
shows an
example
of
a
piano-like
envelope
setting.
Raise the
HPF
slider
and
use the Pulse
wave output of the
VCO
with ENV-1 control of pulse
width modula-
tion
for a
harpsichord-like sound.
Try
this
envelope
setting
with different
waveforms
and
RANGE
settings.
(3)
shows
a
very percussive
envelope for
pizzicato-like
sounds.
Try
different
widths
of the pulse
wave
set at 4'
or
8'. Also, try
the
sawtooth
wave
set
at
32'.
(1)
STRINGS
ENVELOPE
HPF
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—
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(2)
PIANO
ENVELOPE
(3}
PIZZICATO
ENVELOPE
HPF
ENV-1
ENV-2
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24