Switching from MS Basic to Kontakt 7 when playing in piano. Then switching to "sforzando," it doesn't produce a sound, then switching to Kontakt 7 again, it sometimes crashes

[Fastball2880]

Issue type

VST bug

Bug description

When I switch the VST in a main piano piece to Kontakt 7 accidentally to go to sfozando instead, then switched to sforzando again, it doesn't produce any sound. So I tested it on a new file on Musescore to test it out and it happened to have the same thing. But it crashed for no apparent reason.

This happened when I installed sfozando for the first time. Reinstalled it, same thing

It also happen to produce sound when I switched it from "Grand Piano" to "Piano,' then it worked, on my main piano piece. Until now when I accidentally switched to to another VST.

VSTs I used: sforzando - https://www.plogue.com/products/sforzando.html Kontakt Player - https://www.native-instruments.com/en/products/komplete/samplers/kontakt-7/

Steps to reproduce

1. Switch to Kontakt 7 VST in the mixer.
2. Then, switch to sfozando, then import an .sfz file.
3. Produce no sound whatsoever. Even restarting MuseScore.

Screenshots/Screen recordings

(In a blank musescore file; fresh file before recording)

https://github.com/musescore/MuseScore/assets/147415340/ea44ca7b-38e8-4912-8100-068ecd276eff

(In the main piano piece)

https://github.com/musescore/MuseScore/assets/147415340/39e34887-f026-46a2-845c-579e1eab1154

MuseScore Version

OS: Windows 10 Version 2009 or later, Arch.: x86_64, MuseScore version (64-bit): 4.1.1-232071203, revision: github-musescore-musescore-e4d1ddf

Regression

I don't know

Operating system

Windows 10

Additional context

sforzando - https://www.plogue.com/products/sforzando.html Kontakt Player - https://www.native-instruments.com/en/products/komplete/samplers/kontakt-7/

[Fastball2880]

Update: when replacing the instrument to any piano-type instrument (for example: "Electric Piano") then back to Piano, sforzando is now producing sound.

This might be Kontakt switching to MIDI output to the instrument, or it might be something else.

[Fastball2880]

Update - I opened one of my projects since a while back from April, and tested it. It seems like switching it still produces sounds. Safe to assume that this is solved, but this needs more testing.

Change to sforzando > change to Kontakt > change back to sforzando > expect no sound, but there is.

https://github.com/musescore/MuseScore/assets/147415340/a8a2046d-dadc-4e90-b56b-d29712b192c5

https://github.com/musescore/MuseScore/assets/147415340/4fb348b9-c40b-4b92-9132-6d4d8634c584

[erwald]

I am experiencing very similar issues, but with different plugins. Generally, it seems to happen when first loading one VST, and then loading another one on the same track/instrument. Either what happens is that the second VST has no presets loaded, or it just crashes. If it doesn't crash, it does sometimes crash when I start interacting with the (second) VST. I am experiencing this with a range of different VSTs.

I'm on macOS so it's likely not a Windows issue.

OS: macOS 14.2, Arch.: x86_64, MuseScore version (64-bit): 4.2.0-233521125, revision: github-musescore-musescore-eb8d33c