It became popular years ago when a clip of a Justin Bieber song was slowed down 800%. It's often used in Ambient music and to create pure ambient tracks. Later, another developer, took Paul's algorithm and rewrote it in Javascript, allowing audio processing to take place right in the browser.Ĭredit goes to Paul and Seb for contributing such great opensource software.

This algorith can stretch a 1 second sound into a 24 hour sound while maintaining a smooth sound quality (spectral smoothing). Who Invented Paulstretch?Ī brilliant developer named Paul Nasca created an audio processing algorithm which allows for extreme time stretching. You may email us if you experience any bugs as this is in early beta. If you are having trouble downloading the track, you may want to try in a different browser or on a desktop computer. Once you have captured the sample you wish to record, click the button again, and a download link will appear below the app box. To record: After clicking the play button, you may click the 'record' button. You may adjust frequency and other filters in the mixer panel on the right side of the app. The file is never uploaded to any server, but instead processed in your browser.Īfter the file is initially processed you may click the play button to start hearing back the stretched audio.

Select a file from your local file system. Instructions for Stretching and Recording Audio The inventor explains the process in short as: analyzing the frequencies of an audio clip, splitting it into tiny parts, then randomizing the bits of that part's sounds characteristics, and 'smearing' them together before reassembly. Since digital audio is not really a pure smooth wave (imagine pixels in an image but instead on a waveform), these differences between bits must be smoothed out. Extreme sound stretching works by piping audio through an algorithm which generally averages out the waveform and smooths the difference.

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