SoundTouch is an open-source audio processing library for changing the
Tempo, Pitch and Playback Rates of audio streams or files:
* Tempo (time-stretch): changes the sound to play at faster or slower
speed than original, without affecting the sound pitch
* Pitch (key): changes the sound pitch or key, without affecting the
sound tempo or speed
* Playback Rate: changes both the sound tempo and pitch, as if an LP
disc was played at wrong RPM rate
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