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Sound eXchange
Developer(s)Chris Bagwell, et al.
Initial releaseJuly 1991; 30 years ago (1991-07)
Stable release
14.4.2 / 22 February 2015; 6 years ago (2015-02-22)
Written inC
    Operating systemCross-platform: Windows, Linux, OS X
    TypeAudio editing software
    LicenseGPL v2 or later
    LGPL v2.1 or later

    Amazon.com Logo.png Search SoX on Amazon.

    Sound eXchange (SoX) is a cross-platform audio editing software. It has a command-line interface, and is written in standard C. It is free software, licensed under the GNU General Public License version 2, with libsox licensed under GNU Lesser General Public License version 2, and distributed by Chris Bagwell through SourceForge.


    SoX was created in July 1991 by Lance Norskog and posted to the Usenet group alt.sources as Aural eXchange: Sound sample translator. With the second release (in November the same year) it was renamed Sound Exchange. Norskog continued to maintain and release SoX via Usenet, File Transfer Protocol (FTP), and then the web until early 1995, at which time SoX was at version 11 (gamma). In May 1996, Chris Bagwell started to maintain and release updated versions of SoX, starting with version sox-11gamma-cb. In September 2000, Bagwell registered the project at SourceForge with project name "sox". The registration was announced on 4 September 2000[citation needed] and SoX 12.17 was released on 7 September 2000.

    Throughout its history SoX has had many contributing authors; Guido van Rossum, best known as creator of the programming language Python, was a significant contributor in SoX's early days.[citation needed]


    A SoX spectrogram

    Some of SoX's features are:

    • Cross-platform (Windows, Linux, Solaris, OS X, et al.)
    • Reading and writing Au, WAV, AIFF, MP3 (via an external LAME MP3 encoder), Ogg Vorbis, FLAC and other audio file formats
    • Recording and playing audio (on many systems); playing via URL (internet file or stream)
    • Editing via concatenate, trim, pad, repeat, reverse, volume, fade, splice, normalise
    • Processing via chorus, flanger, echo, phaser, compressor, delay, filter (high-pass, low-pass, shelving, etc.)
    • Adjustment of speed (pitch and tempo), pitch (without tempo), tempo (without pitch), and sample rate
    • Noise removal using frequency profiling, implemented since December 2004
    • Silent passage removal, implemented since September 2001
    • Simple audio synthesis
    • Multi-file & multi-track mixing
    • Multi-file merging (e.g., 2 mono to 1 stereo)
    • Statistical analysis; spectrogram analysis


    SoX being used to process some audio:

    $ sox track1.wav track1-processed.flac remix - norm -3
     highpass 22 gain -3 rate 48k norm -3 dither
    Input File     : 'track1.wav'
    Channels       : 2
    Sample Rate    : 44100
    Precision      : 16-bit
    Duration       : 00:02:54.97 = 7716324 samples = 13123 CDDA sectors
    Sample Encoding: 16-bit Signed Integer PCM
    Endian Type    : little
    Output File    : 'track1-processed.flac'
    Channels       : 1
    Sample Rate    : 48000
    Precision      : 16-bit
    Duration       : 00:02:54.97 = 8398720 samples ~ 13123 CDDA sectors
    Sample Encoding: 16-bit FLAC
    sox: effects chain: input      44100Hz 2 channels 16 bits (multi)
    sox: effects chain: remix      44100Hz 2 channels 16 bits (multi)
    sox: effects chain: norm       44100Hz 1 channels 16 bits
    sox: effects chain: highpass   44100Hz 1 channels 16 bits
    sox: effects chain: gain       44100Hz 1 channels 16 bits (multi)
    sox: effects chain: rate       44100Hz 1 channels 16 bits
    sox: effects chain: norm       48000Hz 1 channels 16 bits
    sox: effects chain: dither     48000Hz 1 channels 16 bits (multi)
    sox: effects chain: output     48000Hz 1 channels 16 bits (multi) 

    Playing some audio files:

    $ play *.ogg
    01 - Summer's Cauldron.ogg:
      Encoding: Vorbis
      Channels: 2 @ 16-bit   Track: 01 of 15
    Samplerate: 44100Hz      Album: Skylarking
    Album gain: -7.8dB      Artist: XTC
      Duration: 00:03:19.99  Title: Summer's Cauldron
    In:20.8% 00:00:41.61 [00:02:38.38] Out:1.84M [  ====|====  ]        Clip:0 


    SoX has had several vulnerabilities listed in the National Vulnerability Database since its last public release in 2015. These vulnerabilities include stack and heap overflows and denial-of-service attacks.

    See also[edit]

    • Digital audio
    • Audio file format
    • Audio signal processing
    • Multitrack recording
    • Audio mastering
    • Sample rate conversion

    Other articles of the topic Free and open-source software : Project Kenai, Gumpy, BLAG Linux and GNU, Waterfox, Mp3splt, Ryujinx, Rialto Toolkit
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    • Free audio software
    • List of Linux audio software

    External links[edit]

    This article "SoX" is from Wikipedia. The list of its authors can be seen in its historical and/or the page Edithistory:SoX. Articles copied from Draft Namespace on Wikipedia could be seen on the Draft Namespace of Wikipedia and not main one.