Soundflower + AU Lab Mojave?
I found this thread on Apple's Support Communities: AU Lab Not working on MacOS Mojave .
There's an answer that states:

Update: I was able to make Au Lab show permission request, finally. I think the reason it didn't ask permission before was that it was somehow cached since I had Au Lab in my /Applications before updating to Mojave.
It did request permission when I downloaded new version from iTunes - Mastered for iTunes - Apple (CA), unzipped it right in my Downloads folder and launched it from there,  without moving to /Applications folder. That's when it said it's an app downloaded from the internet are you sure bla bla and then when I created document it asked for permission.
After that you can delete Au Lab copy from Downloads and continue launching from /Applications — it'll work.

Downloading it and replacing it with the new one from Apple also worked for me.