Okay, I've figured it out.
THIS IS HOW YOU ADD YOUR OWN CUSTOM SONGS TO XI-UTIL FOR USE WITH SPOONYBARD.
If you know how to convert WAV to BGW files (or just use Ximc for now)
Then you can put a "musicXXX.bgw" file
in any music folder for FFXI, "XXX" being a number (Song ID) that isn't used by the game already.
Example
music979.bgw is "FF4 Boss Battle Theme" -> Put this in
C:\Program Files (x86)\PlayOnline\SquareEnix\FINAL FANTASY XI\sound\win\music\data
Go to
Program Files (x86) > XI-Util > SpoonyBard > conf.xml
Open conf.xml and paste the following on a new line along with the other song ID code:Code
<songInfo>
<songID>979</songID>
<name>FF4 Boss Battle Theme</name>
</songInfo>
Example:
Save the XML file, then restart XI-Util. When you go to select your song for zone/NM/buff/etc, it should be in the list of songs to choose from. As Hyshio said, be sure to use the command,
//spoony profile (profilenamewithoutparanthesis) in your Windower console after doing this, and the changes will reflect instantly.
Fortunately, this is much better than just swapping out the music, because game updates will never overwrite "extra" files. :)