Editing Programs: Chapter 6
S4 Plus Reference Manual 67
Filter LFO
Filter LFO (Page 1)
The Filter LFO is most often used to apply tremolo-like or "wah-wah" effects to a sound.
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The following Filter LFO variables will affect the sound only if the FILTER LFO
DEPTH (on Page 2 of the FILTER function) is set to a value other than 0 , or, if Filter
LFO is a source in the MOD function.
Also note that the Filter LFO may have no effect if some other modulation source or
setting has already pushed the filter cutoff frequency to its maximum.
Wave (8 choices)
The waveform determines the shape of the LFO. Use Quad Knob [1] to select either
Sine, Triangle, Square, Up Sawtooth, Down Sawtooth, Random+-, Noise or
Random+. For a graphic representation of these waveforms, see the diagram in the
Wave section of the PLFO description on page 65.
Speed (00 to 99)
Quad Knob [2] controls the speed or rate of the LFO. For fast modulation, increase
this value. For slower modulation, decrease this value.
Delay (00 to 99)
This is the amount of time that is to occur before the LFO fades in. Sometimes, it is
desirable to have modulation come in a moment or two after a note has been played,
rather than starting instantly. The higher the value, the slower the LFO fades in.
Trigger (Mono, Poly, Key Mono, or Key Poly)
The Trigger parameter determines how the LFO should be triggered, or started.
There are four possible settings: Mono, Poly, Key Mono and Key Poly. A description
of these settings is found in the Trigger section of the PLFO description on page 65.
Filter LFO (Page 2)
Level (00 to 99)
This is the base output level of the Filter LFO. If you want to have a constant value of
tremolo to the filter, even without using the Mod Wheel or Aftertouch, set LEVEL
above 00. The Mod Wheel and Aftertouch will add or subtract from this base level.
Example:
If Level is set to 10 and the Mod Wheel parameter is set to 10, there will
always be some filter tremolo, and raising the Mod Wheel will add more tremolo. On
the other hand, if the Mod Wheel parameter is set to -10, raising the Mod Wheel to
the top will cancel out all tremolo.
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