reTuner

reTuner is a precision audio pitch shifting plugin designed to convert music between different tuning standards. It allows you to seamlessly shift the pitch of audio from one reference frequency (e.g., A440) to another (e.g., A432), preserving the character and formants of the original recording.

Built with JUCE and Rubber Band.

Features

• High-Quality Pitch Shifting: Uses the Rubber Band Library for artifact-free pitch shifting.
• Precise Tuning Control:
  • Source A4: Set the reference frequency of your input audio (380Hz - 460Hz).
  • Target A4: Set the desired output reference frequency.
• Multi-Format: Available as VST3, LV2, CLAP, AU and Standalone application.
• Cross-Platform: Compatible with Windows, macOS, and Linux.

Building

reTuner uses CMake for its build system.

Prerequisites

• CMake 3.21 or higher
• C++20 compatible compiler
• Ninja (optional, but recommended for faster builds)

Submodules

JUCE, CLAP and RubberBand are provided as git submodules, make sure to initialize them:

git submodule update --init --recursive

Build Instructions

1. Configure the project:

   cmake -B build -G Ninja

   (Omit -G Ninja if you prefer to use your default generator, e.g., Makefiles or Visual Studio)

2. Build the plugin:

   cmake --build build

   This will compile the VST3, LV2, CLAP plugins and the Standalone application.

3. Run Tests:

   ctest --test-dir build

Installation

Linux

Note: You might need sudo depending on your prefix:

cmake --install build

Mac an PC

WARNING Do not use cmake --install ... to install apps and plugins on these platforms. cmake install for these platforms is set up to work well with cpack, not system installation. Use at your own peril.

INSTEAD After building, the artifacts can be found in the build/reTuner_artefacts directory for plugins and build/src/app/reTunerApp_artefacts for the standalone application. Just manually copy them where you want them.

OR You can use JUCE's copy plugin options in cmake. Search for COPY_PLUGIN_AFTER_BUILD in the JUCE docs for details. Note that this option won't copy the standalone application (reTuner.app or reTuner.exe), and may fail on Windows when copying to system directories.

License

Copyright (c) 2025 Kushview, LLC. Licensed under the GPL-3.0-or-later license. See LICENSE.txt for details.