Roland SH-1 - Page 23

3.
DELAY
TIME
CONTROL
When this
control
is
raised,
pressing a
key
on
the
keyboard
will
produce a
delayed
entry
of the
sine
wave.
This is
especially
effective for
delayed
vibrato
effects,
such
as
in
the
musical
example
shown at
the
right.
The
delayed
sine wave
is also
useful
for
delayed
growl
or wah wah,
and for
delayed
tremolo.
If
delayed entry
of the
sine
wave
is not
desired,
then this
control
must
be set at
"0".
GATE
TRIGGER
SWITCH
When
the
GATE
TRIG
switch
of the
envelope
generator
is set
at
the
LFO
position,
the
frequency
of the
LFO is
locked
to the
keyboard gate
pulse.
What
this
means
is that
when a
keyboard
gate
pulse
appears,
it
triggers
the LFO
to
begin
its
wave
generating
process
from
the
begin-
ning,
or in
other
words
from
the
highest
level
contained
in the
waveform.
With
some
uses
of the
LFO,
this is a
desirable
feature.
The
drawing
at
the
right
shows
what
happens to
the
LFO
waveforms
when
a gate
pulse
occurs.
SAMPLE/HOLD
The
S/H
(Sample
and
Hold)
produces
random
voltage
sequences by
sampling
input
waveforms.
Each
sample
represents
the
voltage
level at
the
instant the
sample
was
taken.
The
HOLD
portion
of the
circuit
holds
this
voltage
level until
the
next
sample is
taken.
The
result
of this
is a
control
voltage
output
which
changes
stepwise in
random
patterns.
When
used
to
control
the
VCO,
this
produces
notes
with
random
pitch
patterns
when
the
Envelope
Generator
GATE
TRIG
switch
is set
at
LFO
and a
key
on the
keyboard
is
pressed,
as
shown
below.
EXAMPLE
OF
DELAYED
VIBRATO
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KEY
TRIGGER
ACTING ON
PHASE
OF EACH
WAVE
SINE
WAVE
to,)
SQUARE
WAVE
cru)
KYBD
GATE
FUNCTION
OF
SAMPLE &
HOLD
NOISE
WAVEFORM
SAMPLING
PULSE
LLL
1111
S/H
OUTPUT
VOLTAGE
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5
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EXAMPLE
OF
SETTING
FOR
RAMDOM
NOTE
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22