Incorrect duration ratio for a duplet taking up odd number of beats (e.g. 5 or 7)

[mishmish-dev]

Issue type

Engraving bug (incorrect score rendering)

Description with steps to reproduce

The duration multiplier for duplet notes is incorrect. Basically, it yields 2:x total duplet duration is x/y (as irreducible fraction). Because of this, duplets taking up full measure in 5/8 time, will consist of two quavers (8ths), having ratio of 2:5, which is bizzare. I would expect to see two crochets (4ths) and 4:5. Generally, the ratio should be between 1/2 and 1.

A real-world example of music like this would be movt. 4 of Ravel's String Quartet. I believe all score editions you'll find would show crochets in duplets that take up 5/8 measure.

Supporting files, videos and screenshots

IMSLP01617-Ravel_-String_Quartet(Score).pdf

What is the latest version of MuseScore Studio where this issue is present?

4.5.2

Regression

No.

Operating system

macOS 15, I believe it occurs on all platforms

Additional context

I guess this is the code responsible for tuplet creation:

MuseScore/src/notation/internal/notationnoteinput.cpp

Line 686 in 42be613

void NotationNoteInput::addTuplet(const TupletOptions& options)

Perhaps it shouldn't try to compute just denominator, but the ratio itself. I'm happy to make a patch myself, looks straightforward, but I'm not 100% sure that I'm not missing anything.

Checklist

• This report follows the guidelines for reporting bugs and issues
• I have verified that this issue has not been logged before, by searching the issue tracker for similar issues
• I have attached all requested files and information to this report
• I have attempted to identify the root problem as concisely as possible, and have used minimal reproducible examples where possible

[mishmish-dev]

Hi @bkunda, could you please elaborate on why you changed this issue to feature? Is the feature ability to change the tuplet number independently of the ratio?

[its-not-nice]

@mishmish-dev The feature is for more options for how certain ratios should be automatically determined (not just this, but also for example using 4:3 or 4:6 in compound time, for example), and better, a way to directly specify the rhythmic unit you wish to use for a tuplet (rather than having to calculate the ratio). This is among many other improvements that tuplet handling requires.