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Phaser block

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Revision as of 18:14, 3 September 2018 by Yek (talk | contribs) (→‎Phaser types)
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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

Phaser types


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.


Set the Phaser to 6 stages to emulate a Mutron Bi-Phase.

"For the double-phaser of the original, set it to 12-stage with LFO Phase at 0." source

=Step Phaser

Set Depth to 0, attach Frequency Start to the Sequencer. Set Min and Max and adjust the Sequencer faders.

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.

Start Frequency

"Another fun phaser trick is to set DEPTH to 0 and assign the Frequency Start to an expression pedal." source


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).