I'd like to edit an existing mod called Touring Carriages.

http://www.nexusmods.com/skyrim/mods/38529/?

One of the things that always bothered me about this mod is while you travel in the carriage you don't hear the wagon sounds you hear at the beginning of the game when you're being carted to Helgen. Does anyone know how to edit the ESP to add a sound in the Creation Kit?