Excellent! Thanks for it.
I will say I looked at all the other threads and nothing seems to be doing anything that would overlap - or anything at all really. This crash is literally happening at the very end of the destruction of the main processor, and everything else has already been destroyed.
The only exception I could think of is the Processor Parameters (which are destroyed by the super class - juce_AudioProcessor). This is why I suspect something to do with having those dangling ValueTrees inside the AP Parameters is not good design. Just riffing though, not really sure why it would cause this error per se.
