Augmented Unisons across voices work fine if the second voice has the conflicting natural (or out of KeySignature accidental) that needs displaying.
But they don't work if the first voice has the accidental that needs to be scanned forward for it:
The fix is at least for voices to iterate by offset across the measure and look at all notes at the same offset first.
There are places where different parts (or at least PartStaffs) should be paying more attention to each other's accidentals (4-part choir music on two staves too) -- that should be thought about in designing this fix, but that'd be a stretch goal to fix.
Need to do in parallel with music21p's interpretation.
Augmented Unisons across voices work fine if the second voice has the conflicting natural (or out of KeySignature accidental) that needs displaying.
But they don't work if the first voice has the accidental that needs to be scanned forward for it:
The fix is at least for voices to iterate by offset across the measure and look at all notes at the same offset first.
There are places where different parts (or at least PartStaffs) should be paying more attention to each other's accidentals (4-part choir music on two staves too) -- that should be thought about in designing this fix, but that'd be a stretch goal to fix.
Need to do in parallel with music21p's interpretation.