SoundTouch Audio Processing Library
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
Olli Parviainen 8562287944 Merge pull request 'Comment out _init_threading call in processFile function' (#1) from shwixel/soundtouch:master into master 4 months ago
.vscode Added tasks.json file for MS VisualStudio Code 4 years ago
bin Merge branch 'master' of 4 years ago
config Merged typo correction patch 4 years ago
include Add 'override' keyword 4 months ago
source Merge pull request 'Comment out _init_threading call in processFile function' (#1) from shwixel/soundtouch:master into master 4 months ago
.gitignore Ignore .vs folders created by Visual Studio 6 months ago
CMakeLists.txt Merge branch 'cmake-openmp' into 'master' 8 months ago
COPYING.TXT Correct fsf address 9 months ago Removed Subversion $Id$, $Date$ etc autoupdate tags 4 years ago
README.html Changed references to 7 months ago CMake fixes for SoundTouchDLL 9 months ago
bootstrap Added unset ACLOCAL to bootstrap to avoid issue that ACLOCAL has been previously set to incompatible value. 4 years ago cmake: remove "CMAKE" compiler definition and instead add mock "soundtouch_config.h" 9 months ago
createsrcpack Removed Subversion $Id$, $Date$ etc autoupdate tags 4 years ago
make-win.bat Windows build: Retargeted to Visual Studio 2019 and Windows 10. Removed obsolete /Gm build option. 2 years ago synced gitlab+codeberg masters 7 months ago
soundtouch.m4 Removed Subversion $Id$, $Date$ etc autoupdate tags 4 years ago Added "" to avoid version number in file names ... retained "" for backwards compatibility 13 years ago

SoundTouch library

SoundTouch git repository moved to

2021-10-14 OP: For some reason that currently is unknown to us, blocked soundtouch account without any prior notice, hence soundtouch repository moved to, hopefully a more stable and friendly home for an opensource project.


SoundTouch is an open-source audio processing library that allows changing the sound tempo, pitch and playback rate parameters independently from each other:

  • Change tempo while maintaining the original pitch
  • Change pitch while maintaining the original tempo
  • Change playback rate that affects both tempo and pitch at the same time
  • Change any combination of tempo/pitch/rate

Visit SoundTouch website and see the README file for more information and audio examples.

The latest stable release is 2.3.1


Use SoundStretch example app for modifying wav audio files, for example as follows:

soundstretch my_original_file.wav output_file.wav -tempo=+15 -pitch=-3

See the README file for more usage examples and instructions how to build SoundTouch + SoundStretch.

Ready SoundStretch application executables are available for download for Windows and Mac OS.

Language & Platforms

SoundTouch is written in C++ and compiles in virtually any platform:

  • Windows
  • Mac OS
  • Linux & Unices (including also Raspberry, Beaglebone, Yocto etc embedded Linux flavors)
  • Android
  • iOS
  • embedded systems

The source code package includes dynamic library import modules for C#, Java and Pascal/Delphi languages.


Source code release tarballs:


SoundTouch is released under LGPL v2.1:

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License version 2.1 as published by the Free Software Foundation.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

See LGPL v2.1 full license text for details.


Also commercial license free of GPL limitations available upon request