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Voice-emphasised Midi Files of the whole work can be downloaded for free from my Website (above). My Website also contains Midi Files for several rather more modern Composers, for which NWC versions may be available.
My thanks to Wim Looyestijn ( https://www.cpdl.org/wiki/index.php/User:Wim_Looyestijn ), whose MusicXML Files I borrowed.
There is an excellent performance of this Work by Schola Gregoriana Ghislieri under Renato Cadel on YouTube starting at https://www.youtube.com/watch?v=u8ta2SF63Ik .