User Manual

CHAPTER 21. LIVE AUDIO EFFECT REFERENCE 321
21.21 Phaser
The Phaser Effect.
Phaser uses a series of all-pass lters to create a phase shift in the frequency spectrum of a
sound.
The Poles control creates notches in the frequency spectrum. The Feedback control can
then be used to invert the waveform and convert these notches into peaks (or poles). Filter
cutoff frequency is changed with the Frequency control, which can be adjusted in tandem
with Feedback using the effect's X-Y controller.
The device has two modes, Space and Earth, for changing the spacing of notches along the
spectrum, and hence the color of the sound. This effect can be further adjusted with the
Color control.
Periodic control of the lter frequency is possible using the envelope section. You can
increase or decrease the envelope amount (or invert its shape with negative values), and
then use the Attack and Release controls to dene envelope shape.
Phaser contains two LFOs to modulate lter frequency for the left and right stereo channels.
The LFOs have six possible waveform shapes: sine, square, triangle, sawtooth up, sawtooth
down and random. The extent of LFO inuence on the lter frequency is set with the
Amount control.
LFO speed is controlled with the Rate control, which can be set in terms of hertz. Rate can
also be synced to the song tempo and set in meter subdivisions (e.g., sixteenth notes).
The Phase control lends the sound stereo movement by setting the LFOs to run at the same
frequency, but offsetting their waveforms relative to each other. Set this to 180, and the