Do not upgrade until compatibility is officially announced. While some 64-bit plug-ins may be considered compatible with macOS 10.15 Catalina, they may not be supported by the manufacturer or have problems with installation or saving. Go to the About The Mac OS Catalina 10.15 Upgrade page for more information. About The Mac OS Catalina 10.15. If you're using one of these computers with OS X Mavericks or later, you can install macOS Catalina.Your Mac also needs at least 4GB of memory and 12.5GB of available storage space, or up to 18.5GB of storage space when upgrading from OS X Yosemite or earlier.
SoundSource makes it easy to apply third-party Audio Unit plugins to any audio on your Mac. This is discussed in depth on the “Audio Effects” page of the SoundSource manual, found within SoundSource.
On MacOS 10.15 (Catalina) and higher, third-party Audio Units might fail to work as you expect. A change made by Apple means that all software must be “notarized” by their security systems. Non-notarized software is entirely prevented from running on MacOS, starting with Catalina.
This change means many older third-party Audio Unit plugins will fail to work as expected. This issue will occur in any modern Audio Unit host, including SoundSource, Apple's own GarageBand, and many others. When attempting to use third-party Audio Units, you may encounter non-functional plugins, error messages, or other undesirable behaviors.
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Next steps from third-party plugin developers
To get their software working on recent versions of MacOS, developers of third-party Audio Unit plugins must issue updates. Once the software is properly updated, the plugins will again work as expected. You should be sure you've got the latest versions for all your Audio Units.
If you have a third-party Audio Unit which does not work on Catalina or higher, you should check with the developer to see if they have an update, and to request one if they don't.
How SoundSource handles third-party plugins on Catalina and higher
If you've previously used third-party Audio Units in SoundSource on MacOS 10.14 or lower, the application will disable those third party plugins when it's first run on MacOS 10.15 or higher. This is done to avoid you being overwhelmed with error messages from MacOS.
You can attempt to re-enable plugins one at a time, by toggling them to the “On” state. It's possible some of your plugins have already been updated, and will work as expected when you turn them back on. If you attempt to activate a plugin which is not properly notarized, MacOS will issue an error, similar to the following:
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As mentioned, the long-term solution is for each plugin developer to issue properly notarized updates to their plugins. If you see an error like the one above, contact the plugin developer for an update. Once a plugin is updated, you'll be able to toggle it back on to have it work as you expect.