When you mention “audio stuff” are you referring to bundling the FMOD dlls and header files into the asset bundle? As I do not believe this is possible. You should be able to use .bank files with AssetBundles.
You can place the .bank files directly into the AssetBundle but you will have to load them by scripting and not through the LoadBank components.
Following would be best possible way to do it as per my knowledge only run that script and depending on complexity of your asset bundle it will create.