Sk Interactive audio
The audio teams at United Front Games used to author their interactive audio and they loved it. Several audio designers used as one of their main tools - every mission had an associated interactive audio script.
Those teams (Sleeping Dogs and Triad Wars) used Wwise by Audiokinetics and a custom engine (not UE4) that was hooked into .
The UE4 plugin is hooked deeply into Unreal and it may have everything that you need to do sophisticated interactive audio. I don’t know if someone has done interactive audio with Sk+UE4 but it should be very doable.
Sk on Apple Macintosh
The SkookumIDE currently is only available for MS Windows. We are updating its user interface in the new year and part of that will be getting it to run natively on Mac OS/X (and Linux).
Until then you may be able to run the SkookumIDE on a Mac using a MS Windows emulator. People have done this successfully in the past. (I don’t know about recently.)
Once the Mac runtime is available and if you have a Windows PC you can also run the SkookumIDE on it and connect to Sk+UE4 running on a Mac.
We may also make a simple command line compiler for Mac OS/X so that you can still work with natively on a Mac before we have the full SkookumIDE ported to Mac.
The Mac OS/X runtime (for a game rather than the SkookumIDE) is being tested right now and it looks good. We will add it to our list of supported UE4 platforms soon.
As soon as we are supporting on the Mac we will let you know.