Offizieller Kommentar
Did you know the purpose of the aggregator itself is to simply create an aggregate audio device ... once? You could do this manually, but the tool is designed to streamline the process.
Given that Mojave doesn't come out until Sept/Oct, we've got plenty of time, but I could also teach you how to set this up yourself so you don't need to rely on this tool to do it for you. ;)
Thanks for the feedback!
