Alesis S4 Plus Reference Manual page 106

Editing Effects: Chapter 7
Pitch (Page 2)
If the Pitch type is Mono Chorus, Stereo Chorus, Mono Flange or Stereo Flange,
page 2 of the Pitch function contain the following four parameters:
Waveform Shape
Quad Knob [1] determines the LFO's waveform shape. This parameter only appears
when the Mono or Stereo Chorus or Flange are selected. The Waveform Shape of
the LFO can be changed from a sine waveform, which provides a smoother, more
even sound, to a square or triangle waveform, which makes the Chorus or flange
effect more pronounced.
Speed
Quad Knob [2] is used to adjust the LFO Speed of all Pitch types, with the exception
of Pitch Detune and Resonator.
Depth
Quad Knob [3] is used to adjust the LFO Depth of all Pitch types, with the exception
of Pitch Detune and Resonator. The LFO Depth, which is the amount of pitch
alteration, can be adjusted to produce the desired effect.
Feedback
Quad Knob [4] is used to adjust the LFO Feedback of all Pitch types, with the
exception of Pitch Detune and Resonator. A portion of the output of the Pitch section
can be "fed back" into the input in order to make the effect more tonal or pronounced.
Detune
If the Pitch type is Pitch Detune, page 2 will have only this parameter. Use Quad
Knob [1] to adjust the tuning of the Pitch Detune effect.
Resonator Tuning and Decay
If the Pitch type is Resonator, page 2 of the Pitch function will have two parameters.
Use Quad Knob [1] to adjust the Resonator tuning, and Quad Knob [3] to adjust the
Resonator Decay.
S4 Plus Reference Manual 105