Is there a reason to use VST3 rack plugin over VST2? Or vice versa?
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Looks like there are still a few problems with the VST3 and certain DAWS. I’d go for VST2 for now.
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So weird, 
I’ve been considering asking the exact same question lately. So I did a bit of research, but not much.
What I’ve read online is that VST3s are generally more CPU efficient and allow more routing options, but I don’t know if this is the same with Rack. I’ll have to do some tests to know.
I use Studio One, and the VST3 does not allow multiple midi input channels, so I’ll stick with the VST2 for now. But I would also love to know if there are any benefits to using VST3.
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Sadly, parameter saving is still not working in VST3. Not sure why, but it’s fine for AU, VST2, and Clap versions.