X

Chapter 10 Modulation eects 205
Phaser eect
The Phaser eect combines the original signal with a copy that is slightly out of phase with the
original. This means that the amplitudes of the two signals reach their highest and lowest points
at slightly dierent times. The timing dierences between the two signals are modulated by two
independent LFOs. In addition, the Phaser includes a lter circuit and a built-in envelope follower
that tracks volume changes in the input signal, generating a dynamic control signal. This control
signal alters the sweep range.
Sonically, phasing is used to create whooshing, sweeping sounds that wander through the
frequency spectrum. It is a commonly used guitar eect, but it is suitable for a range of signals.
Phaser parameters
•
Filter button: Turns the lter section on or o, which processes the feedback signal.
•
LP and HP knobs and elds: Rotate to set the cuto frequency of the lowpass (LP) and highpass
(HP) lters.
•
Feedback slider and eld: Drag to determine the amount of eect signal routed back into
the input.
•
Ceiling and Floor sliders and elds: Drag to determine the frequency range aected by the LFO
modulations. Drag the blue area to move the entire range.
•
Order slider and eld: Drag to choose phaser algorithms. The more orders, the stronger
the eect.
•
The 4, 6, 8, 10, and 12 settings switch between ve dierent phaser algorithms. All are
modeled on analog circuits, with each designed for a specic application.
•
The odd-numbered settings (5, 7, 9, and 11) don’t generate actual phasing eects. The more
subtle comb ltering eects produced by odd-numbered settings can, however, be useful.
•
Env Follow slider and eld: Drag to determine the impact of incoming signal levels on the
frequency range (set with the Ceiling and Floor controls).
•
LFO 1 and LFO 2 Rate knobs and elds: Rotate to set the speed for each LFO.
•
LFO Mix slider and elds: Drag to determine the ratio between the two LFOs.
•
Env Follow slider and eld: Drag to determine the impact of incoming signal levels on the speed
of LFO 1.
•
Phase knob and eld: Rotate to control the phase relationship between the individual channel
modulations. Available only in stereo and surround instances. At 0°, the extreme values of the
modulation are achieved simultaneously for all channels. At 180° or −180°, there is the greatest
possible distance between the modulation phases of the channels.
•
Distribution pop-up menu: Choose how phase osets between individual channels are
distributed in the surround eld: “circular,” “left↔right,” “front↔rear,” “random,” or “new random.”
Available only in surround instances.