I’ve noticed that Apple’s developer documentation is getting poorer and poorer. They used to be one of the best at providing information to their developers, now it seems like more of an afterthought. I tried plowing through some of AUv3 docs a while back and was very disappointed with the lack of detail. Hopefully they will fix the bug soon. 
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Yep! For example, here’s some of the undocumented API I would need to figure out:
https://developer.apple.com/documentation/coreaudio/1422524-audioobjectgetpropertydata?language=objc
or:
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I see what you mean. I guess you just have to make an educated guess. Without some info on the returned data it’s just a shot in the dark.