[LAU] Filtering out everything but the centre position in stereo

Hey hey,
is there an effect or a method to filter out everything from a stereo file but
the "centre"? A sort of reverse karaoke effect.

In theory I'd know what to do, just not how to achieve it. i.e. find all the
differences between the channels and subtract the respective difference from
each channel.

Any good tool/plugin or method to implement in something like Csound is
appreciated.

Best wishes and thanks,

jeanette

-- 
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