BandMatrix

Released — Version 2.3.0.

6-Band SideChain Compressor / Expander Router

BandMatrix is a dynamics plug-in (AU / VST3) built for multi-band sidechain compression with flexible key routing. Each band can be driven by the internal signal, the external sidechain input, or even an arbitrary other band — so you can create targeted, musical ducking and inter-band control. Version 2.3.0 should resolve the phase issue affecting the universal mix control.

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macOS: AU / VST3 for macOS 11 or later • Windows: VST3

Download v2.3.0 (PKG) Download Windows VST3 (ZIP)

The latest macOS release is v2.3.0, which should resolve the phase issue affecting the universal mix control. Windows VST3 download remains available on this page.

What it does

Split the signal into multiple bands and apply independent compression per band.
Per band, choose a key source: Internal, External sidechain, Mix, or Other band.
Create precise ducking (e.g., kick → bass low band) and inter-band control (e.g., harsh band → tame presence) without affecting the entire spectrum.
Version 2.3.0 should resolve the phase issue affecting the universal mix control.
Tone Shaper mode adds a more flexible way to shape spectral balance inside the band matrix workflow.
The window is now resizable for easier editing on different screen sizes.

BandMatrix UI screenshot — Screenshot: band routing, key selection, and per-band gain reduction.

Release history

v2.3.0 — Universal mix control phase issue update.

Current macOS release.

This release should resolve the phase issue affecting the universal mix control.

v2.2.0 — Window resize recall and universal mix improvements.

Previous release.

Window size is now remembered between launches.
Improved the universal mix control.

v2.1.0 — Window state, Tone mode efficiency, and mix control.

Previous release.

Window size is now remembered between launches.
Reduced CPU usage in Tone mode.
Added a universal mix control.

v2.0.0 — Master metering and trim.

Previous release.

Added master input/output metering.
Added a master output trim control.

v1.9.0 — Minor bug fixes.

Previous release.

Minor bug fixes.

v1.8.0 — Parallel processing support and general improvements.

Previous release.

Added parallel processing support.
Additional improvements and refinements.

v1.7.0 — Bug fixes.

Previous release.

Bug fixes.

v1.6.0 — Possible Windows issue fix.

Previous release.

Includes an update intended to resolve a reported Windows issue.

v1.5.0 — Inverse sidechain mode.

Previous release.

Added Inverse sidechain mode.

v1.4.1 — Possible loading issue fix.

Previous release.

This update may resolve an issue where the plug-in could fail to load in some environments, but this has not been fully confirmed yet.

v1.3.0 — Tone Shaper mode and resizable window.

Earlier release.

Tone Shaper mode is now included in the release build.
Window size can now be adjusted to fit different workflows.

v1.2.0 — Bug fixes.

Earlier release.

v1.1.0 — Minor bug fixes.

Stability update following the original release.

v1.0.0 — Initial release.

First public release of BandMatrix.

Typical use cases

Kick / Bass

Duck only the bass low band from the kick, keeping mids and highs stable and punchy.

Vocals / Music

Make space for vocals by gently ducking specific instrument bands using internal or external keys.

Sound design

Create inter-band dynamics (one band driving another) for movement, emphasis, and controlled aggression.

Requirements

macOS 11 or later.
A plug-in host that supports AU or VST3.
Installer: BandMatrix_2.3.0.pkg

Note: The installer includes AU / VST3 builds that target macOS 11 or later.

Install

Download the latest BandMatrix_2.3.0.pkg from this page.
Run the installer (it installs AU / VST3 to the standard macOS plug-in locations).
Launch your host and rescan plug-ins if needed.

Support

Email: kjdevapphelp@gmail.com

Please include: OS version, host app version, and a short description (or screenshot) of the issue.