Implement Sostenuto Pedal and Depressed Keys Playback

[Fourniture]

Your idea

The Sostenuto pedal on a piano is used to create certain effects and has a distinct sound:

Screen_Recording_20250101-233723_Voice.Recorder.mp4

And similarly for silently depressed keys, which also cause a type of echo in the piano.
Please consider implementing realistic playback for this in both MuseSounds and MS Basic.

Problem to be solved

There is no playback for this. (Obviously, Musescore does not yet recognize specific notation for silently depressed keys. Perhaps this would be something for sound flags.)

Prior art

No response

Additional context

No response

Checklist

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