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+# SoundTouch library
+
+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](https://www.surina.net/soundtouch) and see the [README file](https://www.surina.net/soundtouch/README.html) for more information and audio examples.
+
+## Example
+
+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](https://www.surina.net/soundtouch/README.html) for more usage examples and instructions how to build SoundTouch + SoundStretch.
+
+Ready [SoundStretch application executables](https://www.surina.net/soundtouch/download.html) 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.
+
+## License
+
+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 ](https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html) for details.
+
+--
+
+Also commercial license free of GPL limitations available upon request