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Rotary Speaker Plugin by eaReckon
EARevolve by eaReckon is a Virtual Effect Audio Plugin for macOS and Windows. It functions as a VST Plugin, an Audio Units Plugin, a VST 3 Plugin and an AAX Plugin.
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eaReckon EARevolve is the combination of a stereo chorus and a (mono to stereo) rotary speaker.

This AAX/VST/VST3/AU plug-in for Windows (32/64-bit) and MacOS (64-bit) has been designed to add depth and/or controlled movement to your sounds.

It is particularly efficient at turning a mono signal into a dynamic and deep stereo sound.


A stereo chorus can give stereo width to a mono sound (or enhance it when the source is stereo).

When using a chorus with stereo width in mind, musicians usually want to avoid the sense of movement between the left and the right channels that could be introduced by the effect.

It is not uncommon to hear that a good stereo chorus is the one that you just "forget" until someone turns it off. This kind of chorus effect voluntarily limits the sense of movement and generates a nice stereo depth.

Even though EARevolve's stereo chorus is able to do this, it does not limit you to this single application.

Key features (Stereo Chorus):

  • 2x2 lines (2x stereo chorus).
  • Common parameters: Base Rate, Depth amount, Randomness, Shape (triangle/sine).
  • 1st stereo chorus parameters: Delays (L/R), Right Phase offset, Crossmix, HPF frequency.
  • 2nd stereo chorus parameters: Delays (L/R), Right Phase offset, Rate ratio, LPF frequency.


A rotary speaker obviously generates a sense of movement that is not limited to a simple panning.

The Doppler effect, natural filtering and level variations provided by the rotation of two parts, form a complex modulation effect. If we add the characteristics of the room, the position of the microphones and the position of the cabinet itself, we start to get quite a number of parameters to consider.

A logical choice could be to limit the number of parameters available to musicians and technicians, by limiting ourselves to the reality of a hardware rotating speaker. Limiting the number of parameters is also an excellent option if we want to let everyone easily control the effect for the musical use it was formerly intended for.


  • What else could we obtain from it if we could freely manipulate the angles of both the horn/drum parts and even the location of the cabinet itself, from a remote control, like controlling a drone?
  • Why not control the affects of these movements on the sound, forgetting about physical reality, and use them to our musical advantage?
  • Finally, why not synchronize all of this to the tempo of our music, or automate the whole thing?

These are the questions that led to the choice of flexibility for the rotary speaker part of EARevolve.

Key features (Rotary speaker) :

  • Classic rotary speaker properties (rotation speeds, acceleration, deceleration, saturation) + A/B speed selector and brakes.
  • Advanced "Horn" and "Drum" properties (Doppler effect, Gain modulation, LPF modulation, Multi-band tool, ...).
  • Adjustable speaker size (diameter).
  • Rotation speeds are synchronizable to the host tempo.
  • "Park angle" options.
    It is possible to set the position (angle) at which a rotor will be stopped.
    Once this rotor stopped, the angle can be freely manipulated or you can make it follow the center of the room or the microphones.
  • Advanced microphone settings (adjustable polar diagrams, Mid/Side mode, ...).
  • Adjustable room properties (room size, early reflections, ...).
  • Adjustable position of the rotary speaker + (optional) automated/synchronizable movement of the speaker in the room.

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