Insert Additional Stage Textures into Cycling Pack (KTAR)

[rorycosgrove]

So I recently downloaded Keitaro's wonderful KTAR 8 hack pack for Brawl. Seeing as it already contains a codemanager and everything else in place, I was hoping to be able to use it as a template to further customize to my liking. The pack has a system of cycling between multiple stage textures, so I wanted to be able to add new textures I found to the pack, simply by pasting them into the folder. Well as you might have guessed, it was not that simple. The stages I added would only show up in the cycle if their file names replaced those of the existing stages, for example: Final Destination had a few entries such as STGFINAL_B.pac. The letters went up to D so I tried naming one of the new files "STGFINAL_E.pac" but I can see it doesn't work that way.
So basically I'd like to know if there is any way to add additional textures to a pack and have them cycle as the existing textures do. I'd appreciate any help very much, thanks