Please explain notegrouping rule

Bar 1: Default Dorico

Bar 2: Old Forster Publ. (Chicago) manuscript (with Forced duration)

Bar 3: When the first beat in LH and Ped is ‘undotted’ the tie is replaced by a quarter note.

The default Dorico looks wrong/inconsistent to me, with different RH and LH/Ped displays. Is this some (Gould) rule that I have missed?

UP1.dorico (571.6 KB)

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Dorico detects syncopations of quaver - crotchet - quaver, which is what it has done in the right hand of bar 1 – and in the left hand of bar 3 – but not in the left hand of bar 1, because the quaver isn’t there.

I’d suggest that you will need to use Force Duration to match bar 2, which is the best result.

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Not sure if it’s in Gould or not, but I thought the rule with syncopation in 3/4 was that you should show 2 strong beats if possible. I “think” that’s what Dorico is doing here, so the treble staff shows beats 1 and 2 in bar 1, and the bass staves show beats 1 and 3. Of course in your example, it’s the same player so the strong beat rule doesn’t really apply as they can look at the other staff for beat alignment, and Dorico’s default ends up looking pretty weird.

I think you’ll just have to use Force Duration, but it could be nice if Dorico could consider the input in other staves for instruments that use multiple staves, so bar 2 could be achieved by default.

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Yes, just looking at the manuals in bar 1 would mean it would also occur for piano. I agree that it would be best if Dorico considered the instrument instead of individual staves (this must happen in a string section too where the instruments are indeed ‘isolated’?). Perhaps in a ‘nearby’ version…

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… though of course there would be many ‘edge cases’ between both hands having the same rhythm and each hand having different rhythms…

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Indeed.
Perhaps it could fit into a future “InDesign Preflight” window that lists possible “inconsistencies/errors” instead of a firm engraving ‘rule’ if it would be too complex to define.