"SOLO Selection" feature.
The one thing I want in Musescore 3 is a SOLO Selection feature. Basically, whatever I select, I want to be able to press play and hear ONLY what I have selected.
Example: In an orchestral piece, I want to select a few notes in the Violin I staff and play back just that selected region so I can hear it by itself. When I deselect the notes, all the parts play back as normal. Or, if I select some notes in the treble clef of the Piano's grand staff, I would only hear those selected notes in the treble clef.
How it works:
Make a note selection and press Alt+Spacebar.
"Normal" Playback = Spacebar
"SOLO Selection" Playback = Alt + Spacebar