The MP host will scan
(by scan we mean that it read and display just the filenames at first and fully scan a plugin once you choose to load/use the plugin)
- the AU plugins in /Library/Audio/Plug-Ins/Components
- the VST2 plugins in /Library/Audio/Plug-Ins/VST
- the VST3 plugins in /Library/Audio/Plug-Ins/VST3
If the VST3 plugins are not shown in the MP Host list, navigate to the host.properties folder and rename it or delete it.
Close any MP Host instances you have running.
Then reset the permissions on the VST3 folder by running in the Mac terminal:
enter your password and hit enter. It should not produce any output on the terminal.
As you may have noticed it has generated a new host.properties file.
For more information please see this article on how the MP Host scans and finds plugins.
Plugins also may be removed from the plugin list (after you scan or try to try to load them once) if they are not universal binaries (Apple Silicon ARM and x86). You can find if a plugin is built for both architectures by running lipo -info PLUGIN_PATH in a terminal
For example: lipo -info /Library/Audio/Plug-Ins/
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