The SoundTouch Library is originally written by Olli Parviainen in C++. Although a .NET wrapper library is available, this library aims to be a complete rewrite in C#.

• Easy-to-use implementation of time-stretch, pitch-shift and sample rate transposing routines.
• Full source codes available for both the SoundTouch library and the example application.
• Clear and easy-to-use programming interface via a single C# class.
• Supported audio data format : 32bit floating point PCM mono/stereo
• Capable of real-time audio stream processing:
  • input/output latency max. ~ 100 ms.
  • Processing 44.1kHz/16bit stereo sound in realtime requires a 400 Mhz Intel Pentium processor or better.
• Released under the GNU Lesser General Public License (LGPL) v2.1

Original SoundTouch C++ project: http://www.surina.net/soundtouch

SoundTouch.NET is written in C# and targets .net standard, .net framework and .net core. That makes it usable in most platforms:

• Windows (including UWP)
• Linux
• Max OS
• iOS
• Android