Roland SH-1 - PARTS LIST

ENVELOPE
GENERATOR
"ENVELOPE
GENERATOR
Depressing
a key on the keyboard triggers
the envelope generator
into action. The
envelope
generator
generates a
control
voltage which
varies with time
according
to the control settings. This controi
voltage
is used to controi the VCF cutoff
frequency
point
so as to vary the
tone color
during
the production
of a note, and/or it is
used
to control the VCA to give the
output
sound its loudness contour. The drawing
on the right shows
the four
parts of an
envelope.
The
SH-1
incorporates
two
envelope
generators.
The VCF is controlled by the
ENV-1, while the VCA can
be
controlled
by either the ENV-1 or ENV-2.
ENV-1
has four controls: A (attack),
D (decay), S (sustain}, and R
(release).
ENV-2 has two controls: A (attack) and
R (release)
with
a sustain
level
set
perma-
nently at
maximum.
CONTROL BY ENVELOPE
When controlling the VCF and VCA with
envelopes, four
combinations
are possible;
1. Controlling VCA with ENV-2
Only the VCA is controlled by the AR
sliders of ENV-2
to
synthesize the sound of
strings, etc.
2. Controlling VCA with
ENV-1
Only the VCA
is
controlled
by
ENV-1
to
synthesize piano-like sounds.
3. Controlling both VCF and VCA
with
ENV-1
Both the VCF and VCA
are
controlled
with ENV-1.
This
mode is most frequently
used.
4. Controlling
the
VCF with ENV-1 and
the VCA
with ENV-2
The VCF and VCA are controlled by
different envelopes to synthesize
brass
sounds.
GATE
TRIGGER SELECTOR SWITCH
This
switch selects the pulse
which
will
activate the envelope
generator.
19
ENV-1
OUTPUT (ADSR
KYBD
GATE
ENV-2
OUTPUT
(AR)
A
(ATTACK
TIME)
CONTROL
This slider controls the amount of
time
which is
required for
the voltage to reach
its
maximum ievei after a key is
depressed.
This is
called
attack time.
D
(DECAY
TIME)
CONTROL
This slider controls the amount of
time
required for
the
voltage
to fall to
the level
set by the
SUSTAIN control. This time
is
called
decay
time.
S
(SUSTAIN
LEVEL)
CONTROL
This
slider
determines the
level to
which the
voltage
will fall at the
end of
decay time.
Once this level
is
reached (at
the end
of
decay time)
it
will
be
held until the key is released,
Note that
if the
SUSTAIN control
is set at maximum, there
will
be
no
decay
time
since
the voltage
level cannot fall to maximum. With the
SUSTAIN
control at
maximum, then, the
DECAY control has no effect.
Note that
ATTACK,
DECAY,
and
RELEASE control
time elements
and
SUSTAIN
controls level.
R
{RELEASE
TIME) CONTROL This slider determines the amount
of time
required
for the voltage to
fall
to
minimum level after the release of the key.