1. To start you are going to need these programs.
1. DBO Resource Tool < - Client Side Modding Tool
2. Test song confirmed to work with opening client. - >
3. A tool to convert your files to .ogg format. I found a tool for you here online. - > http://audio.online-convert.com/convert-to-ogg
2. Now you must open your DBO Resource Tool
1. Now navigate to This PC->Windows->Program Files (x86)-> DBO Global->Pack->sound.pak
2. Once you have converted your audio file to .ogg type navigate the DBO Resource Tool as followed. sound->bgm->bgm_main_theme.ogg
(Reminder) Be sure to rename your file bgm_main_theme.ogg before replacing it or the song will not change!
4. Then for the final step you must open, and then click bgm_main_theme.ogg
4. Open the file you converted into a .ogg then press ok, and your done! (HD Music< - Turn Volume down before watching the video or be in for a scare.)
One finished it should sound like this. Ex:
See it wasn't that hard. Now pat yourself on the back for a job well done!