Can anyone explain the purpose of the “first occurrence” accidental option?
I’m a little unclear about what it does and why it’s there. I had thought that it only affected the first note of the next bar (as seems indicated by the pictures), which I would find useful, but as the text below it says, it seems to completely over-ride the preceding options for both octaves and unisons.
It says that other accidentals later in the bar will be suppressed if that option is checked; but there are also other options for whether successive accidentals are shown in the same bar. (Accidental duration rule; Notes for which accidentals have already been stated)