Sox on Windows
You can find binaries and installers for SoX on its sourceforge downloads page The current version the last time this page was updated was 14.4.1. Download the version of SoX appropriate for your system.
First, find the directory where SoX is installed. By default, this is probably C:\Program Files (x86)\sox-14-4-1 or C:\Program Files\sox-14-4-1
This directory needs to be added to your PATH environment variable. Open a command prompt by pressing the Windows key and typing cmd.exe (on Vista or later), or by choosing "Run" from the Start Menu and type cmd (on earlier versions).
Type path into the command prompt and it should return your PATH variable (PATH= followed by a list of directories). To temporarily add SoX to your PATH variable, type the following command (replace the C:\Program Files (x86)\sox-14-4-1 with your SoX directory if necessary):
set PATH=%PATH%;C:\Program Files (x86)\sox-14-4-1
Type path again, and it should return the same list of directories as before, but with the string ;C:\Program Files (x86)\sox-14-4-1 added to the very end. If it returns anything else (e.g., if it only returns the SoX directory), don't proceed to the next step (close the command prompt window and start over). If it returns the same list plus SoX, you can add SoX permanently by using the setx command instead of set:
setx PATH "%PATH%;C:\Program Files (x86)\sox-14-4-1"
On Windows XP, you'll need to install the Windows XP SP2 Support Tools before you can do this.
• Open The start Menu and search for Edit the system environment variables
• Click the first entry
• On the page that comes up click the entry Environment Variables
Then page that comes up should look like this.
Under the User Variables Section look for an entry called Path
Select the entry and click Edit
Another window will show up with a list of entries.
Click new and add the path to sox.
Click ok and repeat the procedure for the system Variables section.
To check that this worked, open a new command prompt and type sox. If this is successful, it will return information on using SoX, but otherwise it should return "sox is not recognized".