As all know, pre-hear from side-bar| myPresets with saved VSTs-presets had to be removed, because it was crash-prone.
I have an idea how to bring it back for user-saved presets with VSTs, and presets where VSTs effects has been inserted.

When a user creates a new preset, either based on VST, or has a VST-effect embedded, and save it as a named preset, LMMS would need to create a render for ~ 3 secd in ogg-forbis /wave. This soundfile should now be associated with that preset!
When the user then, in side-bar, press mouse on that specific preset, the sound-file is played by LMMS. This would give the user a pre-hear from side-bar of the preset, without any VST-related crashing.

Special case: Old presets.
a method for creating and associating old presets in the myPresets| VST folder, that for natural reasons do not have any sound-file associations, is also needed
This is a one-off, and does not even have to be part of LMMS, but could be a utility that users only uses once.