MuseSounds are too quiet.
In a score I made with MuseScore 3, I had a harp instrument set to "piano." When listening to it in MS4 with MuseSounds, I realized that "piano" is barely audible, so I had to change it to mezzoforte. Also, some harp samples are much quieter than others, making it seem like it's occasionally missing notes (especially when playing in octaves). The celesta (MuseKeys) has a similar issue.
There are still tons of bugs with MS4, and I wish the developers had waited longer before releasing it. I'm definitely going to be staying with MS3 for a while, even though I love all of the features MS4 adds.
Comments
I have the same issue, especially with the wind instruments. You can increase the gain on the quieter instruments in the mixer, but only to a certain extent.
On macOS I installed "Background Music" (via Homebrew) to have a louder volume from MuseScore.
It didn't work at first opening, so I had to unset then reset Background Music as system output in system settings.
https://github.com/kyleneideck/BackgroundMusic?tab=readme-ov-file#downl…
Consider that MS3 and MS4 are two different programs that share some UI similarities. I don't have any use for MS3. But as an experiment I sometimes open in MS3, a score I wrote in MS4. I have to make all kinds of adjustments. And still don't have something I like. So there's problems both ways.
There are notes missing in the celesta. Did you look on GitHub to see if it had been reported?