It appears that the newest version of Audacity does, indeed, have
limited support for VST-3 plugins. I discovered that DeBreath does
work, if you place the executable file not in the Plugin folder of
Audacity, but create x86/VSTPlugins folder in Windows and put it there.
This is confusing since my computer is running 64-bit Windows, but
apparently Audacity is only 32 bit.
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