Although it was "tweaked" for 5.1 surround, the SACD was based on the original quadraphonic release. This conversion has been "untweaked" back to the original quadraphonic mix.
The SACD also included a third work by John Williams performing with the English Chamber Orchestra conducted by Sir Charles Groves recorded in 1967 that was also presented in 5.1 surround. I do not know the full provenance of how the 5.1 mix of this recording was created but could not find any reference to it ever being released in quadraphonic so I excluded it from my conversion.
Source: SACD
Converted to: DVD-A MLP 24/88.2, DVD-V DTS 24/48 & Dolby Digital 24/48
