Time-stretching is the general name given to both stretching (lengthening) and compressing (shortening) audio files. The idea is simple enough but the execution of it is much more difficult. In the days of tape recording (and both vinyl and tape playback systems), you could lengthen or shorten a recording by slowing down or speeding up the playback mechanism. This would not only change the length of the recording but also would change the pitch: slowing down the playback mechanism not only lengthened the recording but also dropped the pitch and vice versa. If the aim was to change the length by only a small amount—perhaps to make sure a certain length to synchronize with some visuals—then the resulting ...
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