Roland SH-09 - Control Descriptions; Modulator Section Overview; Modulator Mode Switch; Modulator Rate Control

Control
Descriptions
Modulator Section
The
Modulator
is
a
controller
used tor
producing
regular
changes
in pitch and tone in
the VCO
and
VCF
sections
and for repeatedly
triggering
the
Envelope
generator. The Modulator
is
based on
a
Low
Frequency
Oscillator (LFO)
producing wave-
forms with
speeds ranging from 0.2
to 25 Hz. The
Sample
and
Hold mode also produces
random sig-
nals by
sampling
the output
of the noise
generator
at a rate
determined
by
the LFO.
Mode Switch
This
switch determines which waveform will
be
used for VCO
and VCF modulation.
The
three
options include:
(~\j
(sine wave),
fTJ
(square
wave),
and
Random (S/H) for the Sample
and Hold
output
Rate Control
The
Rate
slider controls
the
frequency or
speed
of
change for all
Modulator
outputs.
Raising
the con-
trol increases
the frequency, which may
be
monitored with
the
associated flashing LED.
r\j
Delay Time
Control
When
this
control
is raised, pressing
a key on the
keyboard
will
delay
the
entry of
the
LFO
sine
wave
to the
VCO
and VCF. Raising
the
control
increases
the delay
time, and lowering
it fully
results in
a
continuous
output with
no delay.
VCO
(Voltage Controlled
Oscillator Section)
The VCO
is the
basic
sound
source of
the SH-09
and is
responsible for
the
pitches
produced
and
the
basic
tone
color
used.
Tune
Control
This
small
tuning knob
controls
the overall
pitch
of
the
SH-09.
The
tuning range
is
±65 cents.
Range Switch
The rotary
Range
switch
changes
the VCO
pitch
in
exact one
octave
steps
from
2'
to
32'
for
a total
range
change
of four
octaves.
MOD
(Modulator)
Control
This slider
changes the pitch
of the VCO
with
the
Modulator
output according
to the Rate
and Mode
shape
set
in
that
section. Raising
the slider
increases
the amount
of change in
pitch.
Control
Voltage
The SH-09
includes
several
VCO
controls
which
are
internally
wired
and
do not
appear on
the VCO
panel.
The
most
important
is the
Keyboard
control
Voltage
which
permanently
controls the
VCO
pitch
in
relation
to the
keys played.
The
VCO may
also
be
controlled
by the
Bender
section
through
the
associated Bender
Sensitivity
control.