Current questions and answers regarding the map editor.

Oligarch, thank you for the advice; I figured out the music. But what should I do with the sounds? I want a specific sound to play at a certain moment (like a horn sound, for example). The Play2DSound function only reads the .xdb format, as I understand it. How do I create it, and is it necessary to create one?
And another question, which might be obvious and not new, but I couldn't find the answer in the search. How do I create an arena? I want a different arena to be used during a castle siege.