KORG Professional Engineer PA3 - Manual (Page 138)

136 Effects
Modulation and Pitch Shift (Mod./P.Shift)
53: Classic Tremolo
This models the highly-acclaimed tremolo circuit that was built
into a US-made combo amp. The Spread setting lets you create a
pan effect that wavers between left and right.
54: 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.
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.
Speed [Hz] 0.10...10.0 Sets the tremolo speed
Depth 0...100 Select the tremolo depth
Spread 0...100
Sets the width of the stereo image of the
effect sound
Level Adjust 1...100 Sets the output level
Wet/Dry
–Wet...
–1 : 99, Dry,
1 : 99...Wet
Balance between the wet and dry signal
Source Off...Tempo
Table , “Selects a modulation source for Wet/
Dry,” on page 107
Amount –100...+100
Table , “Sets the modulation amount for Wet/
Dry,” on page 107
Left
Right
Wet / Dry
Wet / Dry
Stereo In - Stereo Out
Spread
LFO
Tremolo
Tremolo
a
Envelope Sens 0...100
Sets the envelope’s sensitivity to the
input signal
Envelope
Shape
–100...+100 Sets the envelope’s curvature
b
LFO Waveform
Triangle, Sine,
Vintage
Selects the LFO Waveform
LFO Shape –100...+100
Changes the curvature of the LFO
Waveform
c
LFO Phase
[degree]
–180...+180
Sets the LFO phase difference
between the left and right
d
LFO Frequency
[Hz]
0.02...20.00 Sets the speed of the LFO
Envelope
Amount [Hz] –20.00...
+20.00
Sets the amount added to or
subtracted from the Frequency
when the envelope is at maximum
e
Depth 0...100 Sets the initial amount of tremolo
Envelope
Amount
–100...+100
Sets the amount added to or
subtracted from the Depth when
the envelope is at maximum
f
Wet/Dry
Dry, 1:99...99:1,
Wet Balance between the wet and dry
signal
Src Off...Tempo
Table , “Dynamic Modulation
sources,” on page 106
Amt –100...+100 Amount of modulation source
Left
Right
FX Amt
FX Amt
Stereo In - Stereo Out
LFO Phase
LFO Shape
Envelope Sens
+ Envelope
LFO: Tri/Sin/Vintage
Envelope Shape
Tremolo
Tremolo
Level
Louder
Time
Shimmer
LFO Frequency[Hz]=8.0
Envelope Amount[Hz]= –7.0Hz
Depth=100
Envelope Amount= –100 Dry Envelope