Dear Friends, Maybe I discovered the solution: Solesmes follows, in his editions, Paris, lat. 12044 ms, a diastematic source that follows this simple criteria: oriscus shape is determined by the following note:
- if the following note is higher, oriscus will be "high right-pointed" (what we called "normal" shape) - if the following note is lower or unison, oriscus will be "low right-pointed" (the so-called "auctus" shape) Thanks, Sr. Maria Ruth OSB
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