Control
Descriptions
(com)
VCF
Envelope
Control
This control
determines the depth to
which
the
Envelope Mode selected
will modulate the VCF.
With the slider at
'0'
there is no modulation,
increasing gradually
as
the
control
is
raised
to
full
depth
at
'10'.
MOD
(Modulator)
Control
This control allows
the
VCF cutoff to be controlled
by the Modulator
section
output The slider
deter-
mines
the depth of
modulation whose shape and
rate was
selected in the
Modulator section.
Modulation
increases
as
the slider
control is raised,
with no
modulation
when
the
control
is
lowered to
'0'.
Control
Voltage
Inputs
The SH-09
includes
several
VCF controls which
are
internally
hardwired
and do
not appear on
the
VCF
panel. The
Keyboard Control
Voltage
is
permanent-
ly fed
to the VCF
so that the
tone may subtly
follow the pitch,
the way most acoustic instruments
do.
The VCF
may also be
controlled
by
the
Bender
section through
the associated
Bender
Sensitivity
control.
VCA
(Voltage
Controlled
Amplifier Section)
The VCA allows
the
SH-09 output
loudness contour
to be shaped
automatically by
a
control
voltage.
There is no increase in
volume in
the
VCA.
VCA Mode Switch
The VCA
may be
switched between three control
options. Setting the
VCA
in
HOLD mode holds
the
VCA wide
open so that
any sound emerging from
the VCF is
passed
directly
to
the SH-09
output
jacks.
The ENV
f\^
mode shapes the output
volume with the Envelope
Generator
output. The
GATE
_n_
mode shapes
the output volume
direct-
ly
with the Keyboard
Gate, fully
'0'
when
a key is
pressed, fully 'off' the next
instant all
keys are
released.
ENV
(Envelope
Generator)
The Envelope Generator produces a
shaped control
voltage that may
be used
to control
the VCF cutoff
frequency point and/or to control the
VCA
loudness
contour.
Envelope
Mode
Switch
The envelope Generator may be activated
from
the
keyboard in three ways,
depending on the position
of
the
Envelope Mode
Switch. In
the Gate
and
Trig-
ger
mode,
both the Keyboard Gate and
Keyboard
Trigger are
used
to
activate the Envelope (this is
sometimes referred to as a
Multiple trigger). In the
Gate mode, only a
new Keyboard Gate
will activate
a
new Envelope. The LFO mode activates
a
new
Envelope each
time
the
Modulator
LFO begins
a
new cycle
(as
indicated
by
its
LED indicator), with-
in
a
Master
Gate
command from
the keyboard.
Specifics on these choices are given in
the
Opera-
tion
section
of
this text.
Envelope Function
Sliders
The
Envelope
Generator is often referred to as
an
ADSR,
a
term made
from
the
initial letters of the
words
Attack,
Decay,
Sustain and
Release
—
the
four slider functions
within the Envelope
Generator.
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