The ability to bind engine to the book stands in the plans. But initially I decided to do so as it is. to catch potential problems.
Regarding the combination of all audio settings capabilities in a single engine, I experiment, but so far failed to resolve the matter.
About the accuracy of the settings - I think this accuracy is unnecessary. At the moment, you are the first who asked such accuracy :)
A new build on the approach.
It paid attention to glitches manifested in the current version. New products yet.