Filter, Envelope - Yamaha SY-2 Manual

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FILTERS*
Simply
stated,
a ffK«r
atten the harmonics
containecf
in a
note
to
change
its
colof
or timbre.
Each
of
the
preset
tones
as
a design
feature
the
characteristic
harmonic
structure
and nesanam
points
that identify 3 partktiter instrument
To
understand the low
pan
and
high
fWtm,
keep
in
mind
th»
literal
meaning
of
their
names.
The
low
pas
filter,
for
example
passe$
only low
frequencies, cutting oLhers.
The
lever raises
or
tovi^rs
the point
abov« which
this
filter
wlH
not
pass hefinonif^
In
the oppo5ite way,
the high pass
filter will
permit only high
frequencies
above
its
set level
to
pass (cutting those
below
it).
Switch
the
filter
to manuel control
by
putting
the
filter lever
#
in
the "control"
position
{downK You
can
now
control
the
filter
characteristics
(from lowpaas to htghpau; ^nd
degree of resonance^
with the
fihser
frequency and
nesonanoe
ooiKtrols
^
.
The
closer
the
filter
frequency
cwitrols aiv
to the high
poiftion^
the
morK
harmonics
arc alfowed to
pass,
resulting
in a
very
bril-
liant
sound.
When
you
slide either
or both frequency
controls
irom
""low"
to
"hi^'
while holding
a
key down,
the
sound
you
hear changes from
soft
and muted
to brrghl
and
crisp.
|n
the
rpeantime, the
closer
the resonance control
is
to the
maKtmum
IMSition,
the
mors
nasaF the lound becomes;
emphasizing the
fre-
qucncy
just
before
cutoff.
When
you
set
the resonance
control
in
its
center position,
you
can c/eate a
wah-wah
effect
by
sliding
the
frequency
control
back and
forth.
NOTE:
If
the high
filter
is
set
to the "high"
position,
the
fundamental frequency
of
that tone
may
be cut and no
eound
will
occur.
ENVELOPE
<C)€)
The
term "envelope"
may
seem
strange^
however, every sound
event
h«
an
envelope.
If
you draw
a
heavy
Ifne
connecting the
peak^
of the sounds' waveform, you would
have the
event, or
"errvelope"
waveform.
Synthesizers
employ
separate
envelope
gen-
eretort
with a
varying
number
of
controls to
adjust
the
different
portions of
the
envelope waveshape.
The Yamaha
SY-2
preset
voices
all
have
speciai preset envelope patterns,
which sound
as
long
as
the efwekJpe
lever
#
is
set
to "preset"
By
placing
the
en-
velope
lever in
the control
position, the preset envelope
i-s
cancelled
and the
variable
envelope control
#
are
rww
functional.
When
the
.attack
time
control
is
set
to "ilow", a
long
rvse
tiim
results.
When
the release
time
control
is
set
to "fong" the tone
win continue
to
soiind for quite
some
time
after
the
key
is
released.
NOTE: When
all
four oontmla
are
set to their
bottom poshlom
e
perfectlv
flat
envelope
ti
cveeted
-
Le.,
no iound
will
occur.
Lcm P*H
Fiw
FuMStfon
LOIN
High P1W9
Film- Funrtifn
LO'lV
_ ^ HIG"
Set
U
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