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+1As per https://support.apple.com/en-us/HT201532 the third party audio unit plug-ins are to be installed in /Library/Audio/Plug-Ins/Components. However, as per above, the docs in CoreAudio/AudioServerPlugIn.h state that it should be installed in /Library/Audio/Plug-Ins/HAL. Furthermore in the catalina release notes https://developer.apple.com/documentation/macos_release_notes/macos_catalina_10_15_release_notes it states that Legacy Core Audio HAL audio hardware plug-ins are no longer supported. Use Audio Server plug-ins for audio drivers. Which I assume is why fresh installs of catalina do not contain the HAL directory. In my attempts, moving the audio server plugin to /Library/Audio/Plug-Ins/Components results in coreaudio APIs being unable to enumerate the devices, whereas if we created a placed it in the location specified in CoreAudio/AudioServerPlugIn.h it is enumerated. Please advise.