Essentially we require a function to remove vocals in a MP3 file under an web server environment.

The code can be in one or combinations of the following: PHP/ASP/CGI/PERL/SHELL SCRIPTS etc

The steps are:

Decoding MP3
Splitting stereo into mono tracks
Invert the mono track
Reconstruct new MP3 file

The final submission will end up with a function which I can call, something like:

removevocal(file path, output path)

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