Source Audio Vertigo Tremolo User Manual page 13

Speed Knob
Controls the frequency of the LFO, which determines how fast the tremolo effect is. Different effect
types (optical, harmonic, bias) may have different minimum and maximum speeds.
Low Speed
Shape Knob
Sets the shape of the LFO. For most effect types, Sine, Square, and Sawtooth shapes are available. In
the center position, the LFO is typically a sine wave shape. Fully counter-clockwise is a square shape.
Fully clockwise is a falling sawtooth shape. By dialing the Shape Knob somewhere between two
different wave shapes, the LFO shape will be a hybrid shape, blending elements of both of those
wave shape types. The Normal (Optical) effect is an exception: it has a special shape modeled on the
1967 Vibrolux® optical tremolo, which replaces the sine shape on the Shape knob.
The Neuro App and USB Editor provide access to extended effect types that may have special LFO
shapes that differ from the standard sine, square and sawtooth. Using the USB Editor, you can even
create your own custom LFO wave shapes.
SA243
TIME
Sine or Optical
Square
Vertigo Tremolo User's Guide
TIME
High Speed
Sawtooth
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