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Phaser block

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Phaser block.png

Available on which Fractal Audio products

  • Axe-Fx III: 2 blocks
  • Axe-Fx II: 2 blocks
  • AX8: 1 block
  • FX8: 2 blocks

X/Y and channels

  • Axe-Fx III: 4 channels
  • Axe-Fx II: X/Y
  • AX8: X/Y
  • FX8: X/Y


The Uni-Vibe effect is available as a special mode of the Phaser block. Engage the Vibe mode (or select the Classic Vibe type).

The default settings are modeled after the Fulltone Deja-Vibe. source

More settings:

Put the effect before the Amp block.

"You need it before the amp if you want the bump." source

Connect a pedal or switch to the Rate parameter to control speed.

More information:

Barber Pole Phaser

Like the "Shepard" tone, this creates the illusion of a never-ending upwards cycle. Works best when placed at the end of the chain.

Mono and stereo output

Phaser defaults to mono to prevent phase problems when used before an Amp block. To make it stereo, change the LFO Phase setting and place it after Drive, Amp and Cab.


Parameters table

Parameter Axe-Fx III Axe-Fx II AX8, FX8
Type yes
Phaser Mode yes
Order yes
Rate yes
Depth yes
Tempo yes
Feedback yes
Start Frequency yes
Frequency Span yes
LFO Type yes
LFO Phase yes
Bulb Bias yes
Feedback Tap yes
Tone yes
LFO Reset on Bypass yes
Barberpole — Sweep Direction yes
Barberpole — Filter Q yes


"Phasers cause notches in the spectrum which can reduce the apparent volume. It depends on the frequency content. Overdriven sounds have more content and will be affected more. The Level knob allows you to compensate for this."


Increase the Order parameter to simulate phasers such as the EHX Small stone and Mu-tron Bi-Phase.

Feedback Tap

"There is no feedback on a Script 90." source

LFO Bypass Reset

If LFO Bypass Reset is set to anything other than Off, the LFO will be reset to the selected phase whenever the block is bypassed. This allows synchronizing the sweep to the engagement of the effect.


Thump when engaging the Phaser

If engaging/bypassing the Phaser block causes an audible thump, change input impedance to 1M (Axe-Fx II, III and FX8).