Scrubbing Playback/Arrangement check in Notation Mode

Your idea

I would love to see a feature like the scrubing Finale had. In Notation mode it would be great to play and hold all instruments on a specific beat to check the harmonic arrangement and transitions.

The requests https://github.com/musescore/MuseScore/issues/26076 and https://github.com/musescore/MuseScore/issues/21678 adress a related but distinct usecase. More like a pace controlled playback mode. That usecase would imply an other UI logic.

This "one key playback" could be a sensible workaround and could be easier to implement but a true scrubbing would be the most accessible feature for the usecase of checking your composition on the fly.

Problem to be solved

While in edit mode, writing music, I often would like to check harmony arrangement and transitions on the fly.
The playback requires on the one hand at least one click to position the cursor (sometimes i click the wrong spot and mark the measure instead) and hit spacebar to start playback. On the other hand the moment of interest in most cases is played to breefly and you couldn't analyse the arrangement.
A workaround with massively reduced playbacksped is not practical for a quick check.

Prior art

Scrubing by Finale was ideal. They did a very fast and usable controll by holding a key combination and musehover over the moment you want to hear. As long as you hold the keys the time cursor will follow the mouse and continuously play all instruments, that are noted for this moment in time.

A keyboad only command could be the same key combination with arrow keys to step forward/backward.

Additional context

This feature was proposed on the discontinued Musescore issuetracker 14 years ago as an "first copy". https://musescore.org/en/node/9349
In the meantime Musescore is the only major notationsoftware that doesn't suport any feature like this.
It's time to fetch up with the competitors at such an essential feature.

Checklist

• This request follows the guidelines for reporting issues
• I have verified that this feature request has not been logged before, by searching the issue tracker for similar requests

No files, tests, or entry points are named. Start by locating notation-mode playback and input handling, then compare the requested key-held mouse scrubbing with the proposed keyboard-only stepping. Done means a usable way to hold a key combination, follow the mouse or arrows through time, and hear the instruments at the selected moment.