Vibrato, Pulse Width, Portamento - Yamaha SY-2 Manual

VIBRATO
OO
The
effect caJJed "vibrato"
is
a
^amiJiar
one
to alrnost
everyone
involved
in
nnusic.
The
terin
actually
indicotos
« change
in
fraquencvr
both above and
bekiw
the normal
pitch
of the
not«.
This charge
is
quhA
mrntl
and
is
not
to
be
confused with other
effects.
Control
#
cancels
tha
pntet
vibmo
included
in
some
of the
preset voioes,
Ue,, flute,
trumpet,
bow
vtolln,
oboe,
etc.,
and
enablei the performer to
adjust the
rate (speE?d)
and
rfepth to their
own
taste.
Controls arc
for $peed
(rotation
m
the clock-
wise direction causes a faster vibrato
rate)
and
for
depth
(rotatJon
ir^
the clockwise
direction increases
the
amount
of
change
tn
pitchK
NOTE: The
rarte
of
"wali-^^vah" irrcluded in toncfs
of
"funny" and
'*waln gititfir"
as a
preset
part of the
voics,
tan be a
its
red using
xho vibrato
controls. Place the vibrato
lever to ''control" position,
set
the
vibrato
depth
control
{section
Q
J
to the
minimum
(counterclodcwisej
position,.
You can
rtow
adjuit the vibrato
speed
control to obtain the
desired rate of
wah
wrthout
introducing
«
vibrato
effect.
PULSE
WIDTH
&0
The
puJse
width
control
is
used
to
vary
thtf
ratio of pulse height to width.
A
square
wave
is
one form
of
pulsa.
which
in
this case has a rvtio
of
50%
height
and
60%
width
—
hence the natne
squsre wave.
The
tone
quality of
thii
waw^iape
a
¥ary
clarinet
like.
RoduciriQ
the width of the
pulse
will alter the
tons
quality
in
a slightly
different
manner
than
that
performed
by
a
filtBr,
When
the
pulse
width
Is
very narrow,
the
resuhing tone
will
be
briight
and
rather
nasal.
!
PORTAMENTO
The
term "Portamerrto"
Is
a
latin
musical notation used to
indicate
a
soiind gliding
continuously
from
some
selected note
(frequency) to a
second
selectdb!e point,
sounding
all
the intermediate frequencies.
^
This effect
is
designed to function bEivveer any two
keys played
in
sequence,
either
higher or lower,
when
the
portamento
levef
is
on.
The
time required
for
the pitch to
shift
f
roni the
first
note played
to
the second
(oacjilMor stew
rata)
Is
cofitmlted
by the poriBmento^
oontrol
9
.
Tu-ning the
oontrol
*^
''clockwise" increases
the
tline
n^iulred for
the
pitch to
r^ch
the nofnnal pitch
of the second
key
played.
Oonversely,
oounterdockwlse
rotation results
in
a very short period f^st slew
rate).
I