Len property values ignored when opening a MuseScore 3.6/3.7 file in MuseScore 4

[scorster]

Issue type

Import/export issue

Bug description

On opening MS3 scores MuseScore 4 ignores the Len property duration edits made in the MS3.x Piano Roll Editor.

Related: There's no good reason for 3.6's hardcoded 2K upper value limit for the Len property (located in the upper right of the PRE panel.) This has been addressed in MuseScore 3.7 (aka MuseScore 3 Evolution) where the value limit is now 60K. The removal of the 2K limit allows the TAB Ring plugin to work in MuseScore 3.7.

Steps to reproduce

• Create a musescore 3 score
• Add four quarter notes
• With the notes selected open the Piano Roll Editor
• Decrease the Len value by 50% so the the quarters will play back sounding as eighths
NOTE: The Len property is located in the upper right corner of the Piano Roll panel
• Save the score
• Open the score in MuseScore 4
Result: You'll hear the notes playing as regular quarters, not as they did in 3.x

MuseScore Version

MuseScore 4.2

Regression

Yes, this used to work in MuseScore 3.x and now is broken

Operating system

MacOS 13.5.2

[XiaoMigros]

Actually these values are not ignored when importing, as they are still present in the musescore 4 file. they simply dont affect playback.

[scorster]

Thanks for you reply XiaoMigros.

It's quite a relief to know that MuseScore 4 is indeed reading Len values, but it simply doesn't apply the affect during playback.

Since MS4 has no Piano Roll Editor I was unable to see if the Len values were imported and I feared that MS4 was discarding them and that any imported 3.x scores would permanently loose carefully constructed Len values.

I hope this is an easy fix.

With Len playback repaired, and the return of note velocities (Particularly Offset velocities included at import and used during playback), I would definitely take a more serious look at MuseScore 4.

[XiaoMigros]

Offset velocities are converted to absolute velocities on import, and they do affect playback. The user/offset system has been replaced with something more uniform, but imported scores should sound the same in this regard (and the new system is just as versatile as the old).