Blocks Guide Description
The Phaser or Phase Shifter uses a series of all-pass filters with a feedback circuit to create a unique effect. Phase cancellation and reinforcement is used to create notches and peaks, and when these are shifted with an LFO, the distinctive swooshing sweep of the phaser created. Phaser effects can sound watery or airy. Unlike a chorus or flanger, there is no time/pitch modulation involved.
Examples of phasing include The Atomic Punk by Van Halen, Hole in my Life by The Police, Have a Cigar by Pink Floyd, Machine Gun by Jimi Hendrix, Pink Napkins by Frank Zappa, and countless classic 1970s recordings on which phasers are used for both guitar and keyboards, especially electric piano and clavinet.
The Phaser block allows from 2 to 12 stages to be cascaded for subtle or extreme phasing, with positive or negative feedback options offering distinctly different sounds. A flexible, stereo LFO can imitate the classics or provide new modulation possibilities not possible on any vintage phaser. The phaser even includes a special mode based on the Shin-ei™ Uni-vibe™ effect. The phaser block is stereo in, stereo out.
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Owner’s Manual Description
The Phase Shifter, or Phaser, works by cascading a series of all-pass filters and then mixing the processed signal with the input. This causes certain frequencies to be canceled or reinforced, creating notches and peaks. When phase is shifted using a low-frequency oscillator (LFO), these peaks and notches sweep up and down the frequency range to create the phaser’s distinct, hollow, swooshing sound.
The phaser in the Axe-Fx II is extremely powerful. It allows two to 12 stages to be cascaded with positive or negative feedback and a flexible, stereo LFO. It also offers a special mode to recreate the classic ‘vibe effects with astonishing accuracy.
Axe-Fx II Phaser Block Articles
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