Korg pa 900 User Manual page 388

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Effects
384
Modulation and Pitch Shift (Mod./P.Shift)
45: Stereo Tremolo
This effect modulates the volume level of the input signal. The
effect is stereo, and offsetting the LFO of the left and right phases
from each other produces a tremolo effect between left and
right.
Stereo In - Stereo Out
Left
Right
LFO: Tri/Sin/Vintage/Up/Down
LFO Shape
Triangle, Sine,
LFO Waveform
Vintage, Up,
Down
a
LFO Shape
–100...+100
LFO Phase
b
–180...+180
[degree]
LFO Frequency
0.02...20.00
[Hz]
c
Src
Off...Tempo
–20.00...
Amt
+20.00
MIDI Sync
Off, On
MIDI,
BPM
40.00...
d
300.00
Base Note
r...w
Times
x1...x32
Depth
0...100
Src
Off...Tempo
e
Amt
–100...+100
Dry, 1:99...99:1,
Wet/Dry
Wet
f
Src
Off...Tempo
Amt
–100...+100
a: LFO Waveform
This parameter sets the basic shape of the LFO. The Vintage
waveform models classic guitar-amp tremolo.
Triangle
Sine
b: LFO Phase [degree]
This parameter determines the difference between the left and
right LFO phases. A higher value will simulate the auto-pan
effect in which the sound is panned between left and right.
FX Amt
Tremolo
Tremolo
FX Amt
LFO Phase
Selects the LFO Waveform
Changes the curvature of the LFO
Waveform
Sets the LFO phase difference
between the left and right
Sets the speed of the LFO
Selects a modulation source for LFO
speed
Sets the modulation amount of LFO
speed
When this is on, the LFO speed is set
by BPM, Base Note, and Times,
instead of Frequency
MIDI syncs to the system tempo; 40–
300 sets the tempo manually for this
individual effect
Selects the type of notes that
specify the LFO speed
Sets the number of notes that
specify the LFO speed
Sets the depth of LFO modulation
Selects the modulation source of
the depth of modulation
Sets the modulation amount of the
depth of modulation
Balance between the wet and dry
signal
Table , "Dynamic Modulation
sources, " on page 357
Amount of modulation source
Tremolo - LFO Waveform
Vintage
Up
Down
46: St. Env. Tremolo
(Stereo Envelope Tremolo)
This effect uses the input signal level to modulate a stereo trem-
olo (LFO volume modulation). For instance, you can create a
tremolo effect that becomes deeper and faster as the input gets
more quiet.
Stereo In - Stereo Out
Left
Right
LFO: Tri/Sin/Vintage
+
Envelope
Envelope Shape
Envelope Sens
Envelope Sens 0...100
a
Envelope
–100...+100
Shape
Triangle, Sine,
LFO Waveform
Vintage
b
LFO Shape
–100...+100
LFO Phase
c
–180...+180
[degree]
LFO Frequency
0.02...20.00
[Hz]
d
Envelope
–20.00...
Amount [Hz]
+20.00
Depth
0...100
e
Envelope
–100...+100
Amount
Dry, 1:99...99:1,
Wet/Dry
Wet
f
Src
Off...Tempo
Amt
–100...+100
d: LFO Frequency [Hz]
d: Envelope Amount [Hz]
e: Depth
e: Envelope Amount
The graphic below shows an example of tremolo modulation
with negative modulation of both Depth and Frequency. At the
start of the note, the input is at maximum volume. This slows
down the LFO Frequency to 1.0Hz, but also modulates the
Depth to 0–so the tremolo doesn't have any effect.
As the input volume dies down, the Frequency speeds up; the
Depth also increases, making the tremolo effect increasingly
audible. When the input volume approaches silence, the Depth
is at its maximum (100) and Frequency is at 8Hz.
Level
Dry Envelope
FX Amt
Tremolo
Tremolo
FX Amt
LFO Phase
LFO Shape
Sets the envelope's sensitivity to the
input signal
Sets the envelope's curvature
Selects the LFO Waveform
Changes the curvature of the LFO
Waveform
Sets the LFO phase difference
between the left and right
Sets the speed of the LFO
Sets the amount added to or
subtracted from the Frequency
when the envelope is at maximum
Sets the initial amount of tremolo
Sets the amount added to or
subtracted from the Depth when
the envelope is at maximum
Balance between the wet and dry
signal
Table , "Dynamic Modulation
sources, " on page 357
Amount of modulation source
Shimmer
LFO Frequency[Hz]=8.0
Envelope Amount[Hz]= –7.0Hz
Depth=100
Envelope Amount= –100
Time

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