soundtouch: soundtouch (Sound processing library) soundtouch: soundtouch: soundtouch is an open-source audio processing library soundtouch: that allows changing the sound tempo, pitch and playback soundtouch: rate parameters independently from each other. Using it soundtouch: it's possible to for example change the tempo of a song, soundtouch: while the pitch stays the same. soundtouch: soundtouch: soundtouch: soundtouch: