Trombone, Tuba, Bass Trombone not sounding

Issue type

Muse Sounds bug

Bug description

Using latest version of MS 4 and muse sounds, my score, that is a full orchestration, inexplicably mutes the trombones and tuba on some notes, some bars, some dynamics. I can't see any pattern to it. I can hear that it is trying to play all of the notes, but in the section that prompted me to comment here I am using ff and it varies from ff to ppp or less on playback. Bass trombone and Tuba have identical problem. Notes were pasted from strings, but elsewhere pasting didn't stop these instruments from playing back correctly. Bassoon and contrabasses play the same notes perfectly. Switching to MS basic on the affected instruments "solves" the problem.

Steps to reproduce

I have worked for six months on this score in hundreds of versions, always with MS sounds and in MS4, so I really can't say how I got here, but I am not importing VST's or doing anything unusual with the programme.

Screenshots/Screen recordings

No response

MuseScore Version

4.1.1.232071203

Regression

No.

Operating system

Windows 10

Additional context

No response