10.6

Table Of Contents
228Logic Pro Effects
Logic Pro Phaser effect
The Phaser effect 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 different times. The timing differences between the two
signals are modulated by two independent LFOs. In addition, Phaser includes a filter
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 effect, but it is suitable for a range
of signals.
Phaser parameters
Stages knob and field: Choose phaser algorithms (even numbers) or comb filtering
(odd numbers).
The 4, 6, 8, 10, and 12 settings switch between five different phaser algorithms.
All are modeled on analog circuits, with each designed for a specific application.
The 5, 7, 9, and 11 settings don’t generate actual phasing effects. The more subtle
comb filtering effects produced by odd-numbered settings can, however, be useful.
Sweep Mode pop-up menu: Choose a mode that determines the impact of incoming
signal levels on the frequency range. Set the frequency range with the Ceiling and
Floor controls.
Ceiling/Floor sliders and fields: Determine the frequency range affected by LFO
modulations. Drag the green slider area between Ceiling and Floor to move the
entire range.
Rate 1/2 knobs and fields: Set the speed for each LFO.
Sync buttons: Synchronize the modulation speed of each LFO with the project tempo.
Choose musical note values with the Rate 1 and Rate 2 knobs.
Phase knob and field: Control the phase relationship between individual channel
modulations. Available only in stereo and surround instances. At 0°, extreme modulation
values are achieved simultaneously for all channels. At 180° or −180°, there is the
greatest possible distance between channel modulation phases.
(LFO) Mix slider and fields: Determine the ratio between the two LFOs.
Distribution pop-up menu: Choose how phase offsets between individual channels are
distributed in the surround field. Choose from: circular, left↔right, front↔rear, random,
and new random. Available only in surround instances.