Thank you all guys for your inputs. What I have studied so far is that Audya supports the basics of writing user styles on midi. It is even possible to import user audio drums into a style rather than being restricted to Audya recordings alone.

At the other hand I learn that there are some problems invovled with the Style Compiler and that some video instruction would be very helpful.

Overall I expect it not to be extremely complicated to build my styles in one method or another and that Audya will do more in next software updates to make the process of style writing more user friendly.