Effect Types - Source Audio Vertigo Tremolo User Manual

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Effect Types

The Vertigo includes three basic effect types, with more effects available in the USB editor software
or the Neuro mobile app.
Normal (Optical)
Optical tremolo emulates some of the earliest incarnations of tremolo from the 60s, which relied
upon a neon light bulb and a photoresistor to create the effect. An LFO controlled the brightness of
the neon light, and the light that was picked up by the photo-sensitive resistor changes the output
gain. The nonlinear aspects of the light and the photoresistor give the optical tremolo its distinct
character. The Vertigo's optical tremolo was inspired by a 1967 Fender Vibrolux®, which Bob Chidlaw
uses in his office to test sounds while he is creating our effects library.
Harmonic
Harmonic tremolo recreates a unique circuit included in some "brownface" amps made between
1959 and 1963, which alternately modulated the levels of the bass and treble bands in the audio
signal. The result is a very pleasing and complex tremolo that is has some characteristics reminiscent
of a phaser.
Bias
Bias tremolo is an approach to tremolo that involves modulating the bias voltage of the tubes in an
amplifier. This essentially pushes the tubes in and out of saturation, which creates a warm pulsing
sound. As a result of the mild distortion created by the tube saturation, bias tremolo sounds
pleasingly dirty.
Additional Effect Types
Additional effect types can be loaded into the Vertigo using the Neuro App on your mobile device
(iOS / Android) or the built-in USB port (Mac / Windows).
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Vertigo Tremolo User's Guide 11