When i’m in Score editor or the Key editor (MIDI) and have acoustic feedback on, whenever I select aan event I can hear the note playing,
but it never ends, just as if there is no note-off send to the VSTi. Only way to stop the sound is with MIDI reset command.
I have this same problem. Cubase 11 Pro. I just turn off acoustic feedback, find my notes on my midi piano and move them into place. highly annoying and more time consuming.
I have recently encountered, and then read that some VST developers have not properly implemented Note Off messages. They just ignore them, and instead use Note On, Velocity=0, as Note Off. There is a whole nerd-out we could go into about this and Aftertouch. I am learning about VST development, but I am not prepared at the moment to speak with any authority on the subject, so I won’t.
But if this is the case, a third party VST2 may not be responding to the Note Off that Cubase is sending. (Like some instruments in Kontakt)
As stated, I am only just learning VST3, and not sure this is the correct explanation. But it is one possible explanation. Especially if it happens with a third party plugin, but not with a Steinberg one.