Yamaha GX-1 Manual page 13

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TONE
BRILLIANCE:
This effect
imparts
a
glowing
feeling
of
softness to the solo keyboard's tone
quality.
The normal
position of
the lever
is
the
middle
click-stop. If
pressed back, a
soft,
mellow
feeling
is
added. This
gives a beautiful
brilliance
when
pulled out
toward
the player.
RESONANCE:
This
is
an
effect that
accentuates
certain
harmonics of
the solo
keyboard
paralleling the resonance
lever.
Pulling the
lever
toward the player gradually changes the adjustment.
-SUB OSCILLATOR
By means of
a
separate
oscillator,
the tone generator
produces
tremolo, vibrato and wah-wah
in the
Solo Keyboard.
VCO:
Usually called vibrato,
VCO
produces
pitch
changes
in
accordance with
voltage.
The
vibrato effect
grows deeper
when
the lever
is
pulled
toward
the player.
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VCF:
Usually
called
wah-wah,
VCF
changes
the
frequency according
to voltage.
By
pulling the lever
toward
the player
this
effect
becomes
deeper.
VCA:
Usually
called electronic
tremolo,
the
waveform
amplitude
is
changed
according
to voltage.
By
pulling the lever
toward
the player, the
tremolo
effect
becomes
deeper.
SPEED:
The
speed of
vibrato,
tremolo and
wah-wah
increases
when
the lever
is
pulled
toward
the player.
Set the middle
click-stop for
normal
speed.
FUNCTION
:
This
lever selects the
waveform
of
the tone generator.
There
are
6
differ-
ent
functions.
(Sine wave) an undulating sound
(triangular
wave)
a
harder
feeling
than
the sine
wave
(sawtooth wave)
a
high attack
(sawtooth wave)
a
slow speed
attack
(square
wave)
a
sharp-cornered
feeling
S/H
(sample hold)
Set function
lever in this position, then
adjust
the
Auto Rhythm
and
the
Rhythm
Pattern of
the
Sample
Hold
to obtain
the
Sub
Oscillator
effect.
OVERTONE
This sets the
overtone
for the Solo Keyboard.
It
works by
the
same
method
as
the
overtones
in
the pedal board, and
in
the
upper and lower
manuals,
1/8 (128')
is
an
extraordinarily
low
bass
and can be used
as
an
effect .sound.
VOLUME
This
adjusts the
volume
of
the
Solo Keyboard.
A
center
line,
showing
the
stan-
dard
level,
makes
for easy
volume
control.
FOOT
SWITCH (PORTAMENTO):
With
this
switch
in
the
ON
position,
Portamento can be
obtained
in
the Solo
Keyboard
only
when
the
Foot Switch
is
on
(with the Foot Switch
pressed
continuously).
Oscillator slew rate
is
controlled
by
the
Portamento
Lever.
L