Always consult the Owners Manuals first

Rotary block

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Rotary block.png

Available on which Fractal Audio products

  • Axe-Fx III: 2x.
  • Axe-Fx II: 2x.
  • AX8: 1x.
  • FX8: 2x.

X/Y and channels

  • Axe-Fx III: 4 channels.
  • Axe-Fx II: yes.
  • AX8: yes.
  • FX8: yes.

About the Rotary / Leslie speaker

Wikipedia: "The Leslie speaker is a combined amplifier and loudspeaker that projects the signal from an electric or electronic instrument and modifies the sound by rotating the loudspeakers. It is most commonly associated with the Hammond organ, though it was later used for the guitar and other instruments. A typical Leslie speaker contains an amplifier, a treble horn and a bass speaker—though specific components depend upon the model. A musician controls the Leslie speaker by either an external switch or pedal that alternates between a slow and fast speed setting."

Position of the Rotary block

Many players put the Rotary block after the Amp block. Consider placing it before the Amp block, just like you would do with a rotary pedal. Note that, unless you use two amp blocks, the Rotary will run in mono when placed before the Amp block.

Alternatively, run it in parallel to a Cabinet block.

Mono or stereo

The Rotary block is stereo by default. You can run it mono by setting Spacing at 0% and/or Stereo Spread at 0%, or by summing its output to mono, i.e. by placing it before the Amp block.

Tweaking the Rotary

  • If you want less or more throbbing, decrease the Depth values, or add some dry signal.
  • To add more shimmer, increase High Level.
  • Horn Length controls the modulation depth.
  • Change the relative speeds of both rotors by adjusting Low Rate Multiplier.
  • Adjust the Time Constant parameters to adjust the ramp up/down speeds.

Switching between two speeds

To switch between two fixed speeds with a switch:

  1. Assign the Rate parameter to an external controller (switch).
  2. Set Min to (example) 1.600 and Max to (example) 6.300 In the Rate's modifier menu.
  3. Program the MIDI controller to send “127” (using the CC of the switch) for fast and “0” for slow.

Another way to switch between two speeds: use X/Y or Channels and use the same settings except for Rate.

Switching between speeds automatically ramps!

Rotary brake function

Forum member Bakerman explains how to add a "brake" to the Rotary block.

Parameters table

Parameter Axe-Fx III Axe-Fx II AX8, FX8
Rate yes
Tempo yes
Drive yes
Hi Depth, Low Depth yes
Rotor Length yes
Low Rate Multiplier yes
Low/Hi Time Constant yes
Mic Spacing yes
Mic Distance yes
Stereo Spread yes