musescore / musescore/MuseScore
[MU4 Issue] [Muse Sounds] Clarinets (A and bass in A) and Horns (everything not in F) are wrongly mapped
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Description
Describe the bug
Clarinet in A, Bass Clarinet in A, Horns in (everything except F) get mapped to MS Basic instead of Muse Sounds
To Reproduce
Steps to reproduce the behavior:
- Create a new score
- Add clarinet and bass clarinet in A and horns in anything except F
- See all of them got mapped to MS Basic instead of Bb clarinet, Bass clarinet or Horn sounds
Expected behavior
Each of these instruments get mapped to the most similar one available in Muse Sounds
Screenshots

Platform information
- OS: Windows 11
Additional context
Tested on both RC from discord and latest RC build in the nightly folder.
Someone reported it happens with trumpet in A but I couldn't reproduce it.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce the issue by creating a new score and adding clarinet in A, bass clarinet in A, and horns outside F on Windows 11. Trace the instrument-to-Muse Sounds mapping and verify that each instrument selects the most similar Muse Sounds patch instead of MS Basic.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- desktop
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100