In the Paks folder are a bunch of .vpk files I'm pretty much (educatedly) guessing are the default sound files, such as SndUI.vpk, Snd.....vpk, etc. It appears that like when the game looks for custom .xml files for the UI in the custom UI folder, it loads these first and then anything missing is loaded from default. Using this reasoning, it appears they have set it up so that it looks for custom sound files in the custom UI folder > sounds first, and then anything missing comes from the default .vpk file. I read somewhere that the reason the 'sample' button.wav file is in there is to test it in game to see if you have the correct UI loaded (given that custom sounds in the custom UI folder are related to that specific custom UI). According to Mirk (one of the Coders for SoE), you can test the sounds you put in your sounds folder by typing /playsound [name].
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