After enabling the MasterAudio integration in DoozyUI, I started getting these errors... Assets/Editor/DarkTonic/MasterAudio/DTGUIHelper.cs(1171,27): error CS0103: The name 'MasterAudioEventBackend' does not exist in the current context. I'm on mac usaing 2019.2.0b4 and have created 2 assembly definition files for Master Audio (1 for the editor and one for runtime). Not sure if I'm going about the right way!
It sounds like you messed up the installation with your .asmdef files. I suggest you delete them. There is a dependency on the RelationsInspector code that you've missed.
I previously tried making .asmdef files for Master Audio and our other plugins to see if it indeed saved on compile time, and was surprised to find that compile time actually *increased* if you had 2 of our plugins in the project, even if you only made code changes to one. So I abandoned that feature since decreasing compile time was the benefit of it, and it was false.