- InstrumentEngineManager::assign: destroy replaced instrument OUTSIDE mu_
(VST3 terminate/removed can block -> audio loop stall -> bridge Not
Responding, transport stop hangs, notes never off)
- main.cpp LOAD job: DestroyWindow any open editor window of the channel
before assign (replace VSTi -> SF2 with editor alive hung in removed())
- Vst3Instrument: reload() fresh plugin instance on second openGUI after
close (Nexus etc. hang at view->attached() twice on same component)
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