Roland SH-1 - 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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(2)
PIANO
ENVELOPE
(3}
PIZZICATO
ENVELOPE
HPF
ENV-1 ENV-2
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24