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The 'Snack' sound extension adds commands for sound play/record and sound visualization, e.g. waveforms and spectrograms. It supports in-memory sound objects, file based audio, streaming audio, WAV, AU, AIFF, and MP3 file formats, synchronous and asynchronous playback. The visualization canvas item types update in real-time and can output PostScript. New commands and file formats can be added using the Snack C-API. 'Snack' was developered primarily for handling digital recordings of speech, but is just as useful for general audio. It has also successfully been applied to other one-dimensional signals.


User tutorial available in HTML format from; User manual (Tcl/Tk) available in HTML format from; User manual (Python) available in HTML format from


Download version 2.2.9 (stable)
released on 1 December 2004


Related Projects


LicenseVerified byVerified onNotes
GPLv2orlaterJanet Casey12 May 2004

Leaders and contributors

Kåre Sjölander Maintainer

Resources and communication

Audience Resource type URI
Bug Tracking,Developer,Support E-mail

Software prerequisites

This entry (in part or in whole) was last reviewed on 7 January 2008.


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