You can perminently increase the volume via the Synthesizer.
Go to View -> Synthesizer.
Change the volume on the right-hand-side (don't set it to 100%).
Click "Set as default".
Setting the volume too high can result in distortion due to clipping, hence MuseScore sets the volume low by default. However, for pieces with a small number of instruments (probably most pieces made in MuseScore) there is quite a bit of headroom so the volume could be set a bit higher than it currently is,but you still need a low setting for full orchestral pieces. If you want to save a different volume for a particular piece then use the "Save to score" option in the Synthesizer.
As a long term solution, we could look into normalising the audio using the LUFS algorithm.
This is not a bug. The volume in MuseScore respond to dynamics normally, and we need it to be low enough that "fff" does not clip. That means music entered at "mf" (the default) will indeed be quieter than maximum. For future versions, there may be audio compression used to normalize levels a bit.
Comments
You can perminently increase the volume via the Synthesizer.
Setting the volume too high can result in distortion due to clipping, hence MuseScore sets the volume low by default. However, for pieces with a small number of instruments (probably most pieces made in MuseScore) there is quite a bit of headroom so the volume could be set a bit higher than it currently is,but you still need a low setting for full orchestral pieces. If you want to save a different volume for a particular piece then use the "Save to score" option in the Synthesizer.
As a long term solution, we could look into normalising the audio using the LUFS algorithm.
This is not a bug. The volume in MuseScore respond to dynamics normally, and we need it to be low enough that "fff" does not clip. That means music entered at "mf" (the default) will indeed be quieter than maximum. For future versions, there may be audio compression used to normalize levels a bit.