[MU4 Issue] Incorrect Implementation of Fortepiano (symbol: fp) dynamics for Piano playback

[ShawTakeuchi]

Describe the bug

"fp" is incorrectly implemented as "staff volume down". This is incorrectly decreasing the audio for the original long sustained (whole) notes played as forte (f), along with the subsequent notes played as piano (p).

To Reproduce

Attached score (mscz), mp3, and/or image (png)

Expected behavior

"fp" should be implemented by note velocity only, or not decrease the volume for the originally played forte notes.

Screenshots
If applicable, add screenshots to help explain your problem.

Platform information

MS4/4.0 Windows 10/64 on 2022.12.16
Fails with MSBasic Soundfont, and extrnal Piano VST (EastWest Opus)

Additional context

Did not test with MuseSounds Piano, or any other instruments

ms4-fp-20221216.zip

[cbjeukendrup]

For piano, you're absolutely right; for instruments that can do single-note-dynamics, the current behaviour is absolutely desired.

This issue is more general than the fp dynamic, and is logged here: #13877

So I'll close this one as a duplicate of #13877. Thanks for reporting anyway!