If you need pyrubberband, then you need rubberband-cli.But I want to note that it is easier on Windows to work with rubberband-cli through subprocess.Go to: https://breakfastquay.com/rubberband/. Select: Rubber Band Library v4.0.0 command-line utility. Windows executable for the Rubber Band utility program. You will download a folder (leave everything in the folder, and it may not work). You will need to work with rubberband.exe through subprocess. You can write ./folder/rubberband.exe --full-help to learn how to use the command. You should know that this method will cause a delay and works through files, it is not for realtime(even with --realtime). Also not very difficult to write a wrapper to the rubberband DLL file. Through microsoft/vcpkg you can download the DLL file. Then through ctypes make a wrapper. For the wrapper, the link to the C-API(you need exactly this, because Ctypes): https://github.com/breakfastquay/rubberband/blob/default/rubberband/rubberband-c.h