Transposing-instrument key-change bug

• May 2, 2025 - 19:05

In this score excerpt the music modulates from 4 flats to all naturals. The resulting key signatures make sense with "Concert Pitch" checked, but when it is unchecked, the clarinet part is given a nonsensical key signature: There's no natural indicated to correct the previous E-flat, and there are 2 sharps on F. There's also a redundant key signature in the clarinet part at measure 5.

These look like bugs. Is there way to fix them?

My platform and version are as follows:

OS: macOS 15.4, Arch.: arm64, MuseScore Studio version (64-bit): 4.5.2-251141402, revision: ac9d3bc


Comments

Looking at it again, I see odd or redundant courtesy key signatures in the score at measure 5 in the English Horn and Horn parts as well - i.e., in all of the transposing-instrument parts - but not in the parts for the non-transposing instruments.

The change at measure 5 is not redudant (in the parts) as it is in the main score too, this score has 2 key sig changes, 3 key sigs total, the 2nd and 3rd being identical (so yes, redundant, but in the main score too)

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