Here is a comparison of La messa de Nostre Dame Sanctus in different tunings as rendered via Kontakt’s choir sample set. The midi file I used is here. (S.Takahata transcribed the piece to midi) The score with Sonar’s brain-dead accidentals is here.
First version uses Kontakt’s built in adaptive JI (adaptive JI = dynamic pure tuning like this live example video that shows the changes in intonation in real time https://www.youtube.com/watch?v=WB6I6EWWdr4 )
La messa de Nostre Dame Sanctus in adaptive JI
La messa de Nostre Dame Sanctus in Super Pythagorean (scala text file of the tuning)
La messa de Nostre Dame Sanctus in Pythagorean – probably the most historically correct. (scala text file of the tuning)