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On Linux or BSD, you can install the sox command (and some helpful symlinks) from your software repository or ports tree.

You can also install SoX from its home on Sourceforge.net. It doesn't release often, but its codebase tends to be stable, so if you want the latest features (such as Opus support), it's easy and safe to build.

SoX provides primarily the sox command, but installation also creates a few useful symlinks: play, rec, and soxi.

SoX reads and rewrites audio data. Whether it stores the rewritten audio data is up to you. There are use cases in which you don't need to store the converted data, for instance, when you're sending the output directly to your speakers for playback. Before doing any conversion, however, it's usually a good idea to determine exactly what you're dealing with in the first place.

To gather information about an audio file, use the soxi command. This is a symlink to sox --info.

This output gives you a good idea of what codec the audio file is encoded in, the file length, file size, sample rate, and the number of channels. Some of these you might think you already know, but I never trust assumptions when media is brought to me by a client. Verify media attributes with soxi.

In this example, the audio of a game show countdown has been delivered as an MP3 file. While nearly all editing applications accept compressed audio, none of them actually edit the compressed data. Conversion is happening somewhere, whether it's a secret background task or a prompt for you to save a copy. I generally prefer to do the conversion myself, in advance. This way, I can control what format I'm using. I can do lots of media in batches overnight instead of wasting valuable production time waiting for an editing application to churn through them on demand.

The sox command is meant for converting audio files. There are a few stages in the sox pipeline:

In command syntax, the effects step is, confusingly, written last. That means the pipeline is composed this way:

The simplest conversion command involves only an input file and an output file. Here's the command to convert an MP3 file to a lossless FLAC file:

The effects chain is specified at the end of a command. It can alter audio prior to sending the data to its final destination. For instance, sometimes audio that's too loud can cause problems during conversion:

Applying a gain effect can often solve this problem:

Another useful effect is fade. This effect lets you define the shape of a fade-in or fade-out, along with how many seconds you want the fade to span.

Here's an example of a six-second fade-in using an inverted parabola:

This applies a three-second fade-in to the head of the audio and a fade-out starting at the eight-second mark (the intro music is only 11 seconds, so the fade-out is also three-seconds in this case):

The different kinds of fades (sine, linear, inverted parabola, and so on), as well as the options fade offers (fade-in, fade-out), are listed in the sox man page.

Each effect plugin has its own syntax, so refer to the man page for details on how to invoke each one.

Effects can be daisy-chained in one command, at least to the extent that you want to combine them. In other words, there's no syntax to apply a flanger effect only during a six-second fade-out. For something that precise, you need a graphical sound wave editor or a digital audio workstation such as LMMS or Rosegarden. However, if you just have effects that you want to apply once, you can list them together in the same command.

This command applies a -1 gain effect, a tempo stretch of 1.35, and a fade-out:

SoX can also combine audio files, either by concatenating them or by mixing them.

To join (or concatenate) files into one, provide more than one input file in your command:

In this example, output.flac now contains countdown audio, followed immediately by intro music.

If you want the two tracks to play over one another at the same time, though, you can use the --combine mix option:

Imagine, however, that the two input files differed in more than just their codecs. It's not uncommon for vocal tracks to be recorded in mono (one channel), but for music to be recorded in at least stereo (two channels). SoX won't default to a solution, so you have to standardize the format of the two files yourself first.

Options related to the file name listed after it. For instance, the --channels option in this command applies only to input.wav and NOT to example.ogg or output.flac:

This means that the position of an option is very significant in SoX. Should you specify an option at the start of your command, you're essentially only overriding what SoX gleans from the input files on its own. Options placed immediately before the output file, however, determine how SoX writes the audio data.

To solve the previous problem of incompatible channels, you can first standardize your inputs, and then mix:

SoX absolutely requires multiple commands for complex actions, so it's normal to create several temporary and intermediate files as needed.

Not all audio is constrained to one or two channels, of course. If you want to combine several audio channels into one file, you can do that with SoX and the --combine merge option:

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