Rocktron VooDu Valve Online User Manual page 25

The PHASER function is available only in configurations displaying "PHAS" in the
configuration title.
Phase shifting involves splitting the input signal into two signals, then shifting the
phase of different frequencies of one signal and mixing it back with the original signal.
The PARAMETER SELECT control will allow you to access these PHASER parameters:
PHASER I/O The PHASER I/O parameter determines whether the Phaser is active for
the current preset.
DEPTH The DEPTH parameter determines the modulation depth of the phase
shift effect. Higher parameter settings result in the sweep of the filtering
effect occurring over a wider frequency range.
RATE The RATE parameter deterrnines the speed at which the phase shifted
signal is modulated.
RESONANCE The RESONANCE parameter adds feedback to the Phaser so that it has
a more pronounced effect.
STAGES The STAGES parameter determines how many stages of phase shift are
to be active. A parameter setting of "4" produces a result similar to a
vintage Phase 90, while a setting of "6" emulates other phaser pedals.