The new The Song Remains The Same release is not a remaster but what Jimmy Page is calling a "revisit." They are reissuing the DVD and were not allowed (due to legal issues) to edit the video but they could edit the audio. Three consecutive concerts were recorded at MSG at the end of the '73 american tour. In the original movie, some audio parts were switched out to a different night's audio because of "mistakes." That caused the video to be out of sync with the audio. Where possible, for the new issue, Kevin Shirley has replaced the audio with the correct night's audio performance and corrected the "mistakes" using pro-tools (something they could not do in the old days). Also he remixed the audio and even added some effects - all to enhance the sound to present the band's live sound closer to what it would have been live (or so they say) because the original was apparently not the best mix. The new CD is an exact copy of the new DVDs soundtrack. So it is definately not part of a remaster effort, but instead a separate project to "revisit" The Song Remains The Same.