Maps are ultimately representations, which suggest no boundaries as to how it is represented indeed representation is chosen by those representing. They should accepted as a subjective truth insofar that the map is an abstraction derived from something- the geographical territory- but it is not the thing itself.
What I am trying to say is that like any map, sound maps should have no prescribed method. However you choose to represent, do what you want. But here are a couple of methods. (If you’re interested in the philosophy, check out ‘Map-territory relation’ on Wikipedia and the links on there. Bateson, Baudrillard, Korzybski, eat your heart out.)"
http://acousticecologyuoh.wordpress.com/2013/12/04/how-to-make-a-sound-map/