From the "liner notes":

As one "Old Timer" told me in my early days, the transition to stereo in the 1950s was hardly a cakewalk; they had to learn as they went. To be sure, there were incredible successes from those years, but some halls were a challenge.

This edition is a new mix based upon the acoustics of the hall itself in real-time. The original stereo mix was rebalanced using the acoustics of the hall itself to recreate it.

Every effort to preserve the integrity of the original is present, including the sound of the 1956 analog electronics.