I discovered BouDOL dash only yesterday, the window of visualition remains black for me...
There is another software to modify bol files : BOLEditor
Maybe you can try it to see your modifications.
-Open ISO with GCIT
-Extract in GCReEx format in a folder named "MKDD" (for example)
-Copy the .ARC file which you want in MKDD\root\Course\Luigi.arc (or an other)
-Paste Luigi.arc in "ArcExtract/ArcPack" folder
-Drag Luigi.arc on ArcExtract.exe (7 files and 1 folder appear for me)
-Put these 8 elements in a new folder named "Luigi" (The same name as the .ARC file)
-Replace the .BOL file by the modified .BOL (luigo_course)
-Back in "ArcExtract/ArcPack" folder, and delete Luigi.arc
-Drag "Luigi" folder on ArcPack.exe . You have a new modified Luigi.arc file
-Copy or cut Luigi.arc and paste it in MKDD\root\Course\ to replace the original Luigi.arc
-Back in GCIT and save ISO in trimmed size (Choose a simple name). If you had closed GCIT, open MKDD folder in GCIT and save ISO in trimmed size
-Launch it on dolphin
It works very well for me!
I even customized several musics of races =)
Wow! You made a website for modding ! So exciting ! =)
To reverse the track, have you modified the source code of douBOL ?
If you need articles about the modding of mkdd, I have some subjects =D
(musics, 3d models, textures)