Is VirtualCZ supposed to work with Logic Pro 10.6.1 and Catalina 10.15.7? The VST and the Standalone versions are working fine but when I load the AU plugin in Logic Pro it hangs with the beach ball spinning and the only way out is to force quit Logic Pro.
I don't know if that can help you but here's some messages I found in the logs after instanciating the plugin:
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WARNING: The Gestalt selector gestaltSystemVersion
is returning 10.9.7 instead of 10.15.7. This is not a
bug in Gestalt -- it is a documented limitation.
Use NSProcessInfo's operatingSystemVersion property to
get correct system version number.
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Audio engine overloaded, resetting
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A plug-in seems to cause problems running
in Multi Processor (Multi Threading) mode. ("VirtualCZ")