License

pedalboard is Copyright 2021-2025 Spotify AB.

pedalboard is licensed under the GNU General Public License v3. pedalboard includes a number of libraries that are statically compiled, and which carry the following licenses:

• The core audio processing code is pulled from JUCE 6, which is dual-licensed under a commercial license and the GPLv3.

• The VST3 SDK, bundled with JUCE, is owned by Steinberg® Media Technologies GmbH and licensed under the GPLv3.

• The PitchShift plugin and time_stretch functions use the Rubber Band Library, which is dual-licensed under a commercial license and the GPLv2 (or newer). FFTW is also included to speed up Rubber Band, and is licensed under the GPLv2 (or newer).

• The MP3Compressor plugin uses libmp3lame from the LAME project, which is licensed under the LGPLv2 and upgraded to the GPLv3 for inclusion in this project (as permitted by the LGPLv2).

• The GSMFullRateCompressor plugin uses libgsm, which is licensed under the ISC license and compatible with the GPLv3.

VST is a registered trademark of Steinberg Media Technologies GmbH.