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Commands for sound play/record and sound visualization

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 2.2.10 (stable)
released on 14 December 2004


Related Projects


LicenseVerified byVerified onNotes
License:GPLv2orlaterJanet Casey12 May 2004

Leaders and contributors

Kåre Sjölander Maintainer

Resources and communication

AudienceResource typeURI
Bug Tracking,Developer,

Software prerequisites

This entry (in part or in whole) was last reviewed on 15 January 2017.


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