What exactly is "Joint stereo" in the MP3 custom import settings?

Hi
I want to optimize the way I import my cds on itunes and this is the only custom setting that I don't really understand. I read he help guide bit that refers to this and I'm not understanding it fully.
Does it change in any way the left and right channel are delivered to the speakers/earphones from the way they were on the original cd at all? If I leave it to normal, what's different?
Thanks

Quote:
"Joint Stereo is a neat mathematical technique which is used to enhance the quality of compressed digital audio. It generally tends to be associated with the most popular format of audio compression - mp3, but it has also been incorporated into several other formats"
"Joint stereo is a method to save additional space while retaining a stereo signal, exploiting the fact that most music contains relatively little difference between the left and right audio channels"
You can read more at these links:
Joint Stereo - The Myths and the Realities
What is Joint Stereo?

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It does exactly what it ays.
and whether or not I have this checked, I see that the original file seems to be stored within the iPhoto library in the Pictures folder.
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