It should working by default
Try creating folder in SE then put some file and try.
example:
<attackVoice:VOICE1\BABIDI_534_US>
Folder VOICE1 in SE dir.
One thing I noticed, it is not supporting wav extensions. Simple rename(not convert) BABIDI_534_US.wav to BABIDI_534_US.ogg made it work. Of course I do not recomend renaming file extensions instead converting it to ogg(It might be not compatible in other devices for example).