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Multi-Effect by Re-Compose

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Spexx. Create Unique Soundscapes.

Generate spectral effects, from unusual, beautifully sounding reverbs to experimental spectral transformations.

Spexx is a plug-in for spectral manipulation of sound in real-time. It features a smooth spectral freeze and provides various functionalities for interaction with sound, allowing the user to create a wide range of spectral effects, from unusual, beautifully sounding reverbs to experimental spectral transformations.

The user interface is built in a modular fashion, individual effects can be switched on as well as dragged around within the freeze stage (which applies the effect to the captured sound continuously) and the output stage (which modifies a snapshot from the currently frozen signal).

Multi-core support prevents any glitches or audio dropouts. User-controllable parameters for various aspects of spectral resolution allow the user to find the best settings for any environment – in the studio, on the road or in live settings.

Parameters can be fully automated or mapped to external MIDI controllers.

Spexx is available in VST/VST3/AU plug-in formats for macOS (10.9 and later) and Windows (7 and later), supports preset loading/saving and is fully automatable.

Two stages

Spexx consists of two processing stages: A freeze stage captures and accumulates the incoming sound, applying the audio effects to the captured sound continuously, causing the output signal to change over time – like the reverb tail of an echo – plus an output stage which applies a user-defined spectral operation to the signal.

Bypass the freeze stage entirely to apply the output effects directly to the incoming sound.

Seven effects

Two categories of audio effects for the shaping of all kinds of effects: Focus, Feaze, Decay, Damping for the creation of unusual, beautifully sounding reverbs. Mirror, Pitch, Slope to generate experimental spectral distortions. Any combination of these is possible for other unique soundscapes.


The user interface of Spexx has been built in a modular fashion: Drag an individual effect into the desired position in the processing chain to define the signal manipulation. Set an effect to “active” to apply it to that processing stage. Or turn it "inactive" for the signal to remain unaffected.

Click on the button again to restore the main sequence.

Live or studio

Spexx comes with multi-core support to prevent any glitches and audio dropouts. It also features user-controllable parameters for various aspects of spectral resolution that allow you to find the best settings for any environment – in the studio, on the road, or in a live setting.

Parameters can be fully automated or mapped to external MIDI controllers.


New Features in Version 1.1.0

  • Installer (for Windows and Mac)
  • Software version check (with a periodic check for updates)
  • Factory presets (for saving of settings or choosing from a predefined factory setting)
  • AAX support (for use with Pro Tools)
  • Undo / redo buttons (for switching between last settings)
  • Many improvements to performance and stability as well as bug fixes


  • Simple, intuitive user interface designed for maximum interactivity
  • Based on unique mathematical algorithms for the highest possible sound quality
  • Beautiful large display for a clear view of the output signal generated


  • Two processing stages (freeze, output) and seven individual effects (Focus, Feaze, Decay, Damping, and Mirror, Pitch, Slope)
  • Effects freely combinable in a modular fashion (via drag & drop within the processing chain)
  • Floating interactive panel with controls for selected preset
  • Input and output gain controls
  • Reset button to restart accumulator
  • Various parameters for the definition of spectral resolution
  • Expanding library of presets encompassing a number of genres and techniques


  • Audio effects plug-in, supporting VST, VST 3 and AU standards (32 and 64-bit compatible) as well as AAX (Pro Tools)
  • Multi-core support for glitch-free real-time performance

System Requirements

  • macOS 10.9 and later (64-bit compatible only)
  • Windows 7 and later (32 and 64-bit compatible)

Note: The plug-in might run on older versions too, but it's not guaranteed.

Available interface types

  • VST, VST 3, AU or AAX


  • Ableton Live 9 (and later)
  • Bitwig Studio 2
  • Cubase 9.5 (and later)
  • FL Studio 12
  • Logic Pro X (Mac only)
  • Studio One 3 (and later)
  • Machine 2 (and later)
  • Reason
  • Pro Tools 11 (and later)

Any references to any brands on this site/page, including reference to brands and instruments, are provided for description purposes only. For example references to instrument brands are provided to describe the sound of the instrument and/or the instrument used in the sample. Plugin Boutique do not have (nor do they claim) any association with or endorsement by these brands. Any goodwill attached to those brands rest with the brand owner. Plugin Boutique or its Suppliers do not accept any liability in relation to the content of the product or the accuracy of the description. "RHODES" is a registered trademark of Joseph A Brandstetter.

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