Operation
tcont)
put to
excellent use
in
patches
such as the
Tonewheel
Organ or the Synth
Drum, given later.
During this
exercise with Resonance,
you
may
notice
that its note
will roughly
follow the
keyboard.
This is
an indication that
the SH-09
Keyboard
Con-
trol Voltage
that the
VCO pitch
follows is also
alter-
13
mg the
tone
slightly
as
you play,
brighter
tor higne-
notes,
more meliow
for
lower notes
This
allows
your patches to
follow
the keyboard
tor
changes
in
tone following changes in register or pitch
just
the
way
most acoustic instruments
do,
giving
added
realism and
sensitivity
to
your synthesizer sound
Voltage
Controlled
Amplifier
Your sound
has
originated
in the
VCO, passed
through
the Audio
Mixer and the
Voltage
Controlled
Filter,
and will
now
pass
through the
Voltage
Con-
trolled
Amplifier
on its way to
the
SH-09
output
jacks
for external
amplification
and/or
headphone
monitoring.
The Voltage
Controlled
Amplifier
(VCA) does
not
actually
amplify the sound,
but
controls
the shape
of
the
Volume.
Three VCA
control
options are
offered: Hold,
Envelope control and
Keyboard
Gate
control.
The
Hold position opens
the
VCA fully,
allowing
any sound leaving the
VCF
to pass
unchanged
through
to the
various outputs
As iong
as a
sound
is
present in the
VCF and the filter cutoff, is
high
enough
to
let that
sound
pass,
the
VCA Hold will
present
a
continuous sound at
the
outputs This
is
particularly
helpful
for continuous
sounds such as
wind, surf,
certain Sample &
Hold applications, pro-
cessing
external instruments
and for
ease
in tuning
The Envelope
and Gate options
tor VCA
control
allow notes to
start and end
in silence and be
shaped by a preset Gate
or adjustable Envelope.
both initiated in some
way
by
the
keyboard. These
options
will
be
detailed
in
the
following Keyboard
and Envelope
sections.
Keyboard
Functions
The keyboard of the
SH-09 produces
no sound of
its
own,
and functions
only
to
control
other sections
of the synthesizer.
The
SH-09 produces three dis-
tinct Keyboard
Controls, the
Keyboard
Control
Voltage,
Keyboard Gates and
Keyboard
Triggers.
Keyboard
Control
Voltage
The
SH-09 keyboard continuously
produces a
Keyboard Control Voltage that
corresponds directly
to
the
keys
played on the
keyboard. You have
already used the
Keyboard Control
Voltage
(KCV)
to
automatically control the
VCO and Sub-Oscilla-
tor pitches
from the keyboard.
The same
KCV
is
permanently routed to
control the
VCF
cutoff
fre-
quency, adjusting the
tone brighter
for high pitched
notes
and more
mellow for notes pitched
lower just
as
other
instruments change tone as
they change
range or register. This
KVC control
of
the
VCF
cutoff
was
illustrated
by
controlling the
pitch of the
VCF when it was in
self-oscillation.
As mentioned
previously, the
SH-09 is
a
solo
instrument
—
as
are the
vast majority of
other
musical instruments.
Only one
note
at a
time may
be
produced and the
keyboard accordingly
pro-
duces
only one
KCV
at a
time. The SH-09
keyboard has
low note
priority
—
if more
than one
note is played at a
time,
the bottom one
will
be
sounded.
In legato
playing where
the playing
of
keys overlaps,
new keys depressed to the left
will
change the pitch
while new keys
at the
right will
not change
the pitch
until any
keys to its left are
released.
The Roland SH-09s
Keyboard Control
Voltage
references
to
a
linear
one
volt per octave, produc-
ing exactly
one more volt for each octave higher
played
on
the
keyboard. Keyboard Control Voltage
input and output jacks
are available on
the
SH-09
back
panel
to
allow interfacing with other compati-
ble instruments and
equipment such
as the
Roland
CSQ
series digital sequencers.
Roland
features the
most comprehensive interfacing alternatives availa-
ble, some of which are detailed
in
the
Interfacing
section of this manual. The linear one volt per
octave
KCV
is an industry standard and is com-
patible
with
most
other major brands for
the
ulti-
mate
in
flexibility and
expansion for
your SH-09.
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