Here's how you do Fitted mods for the game (NO BPM OR CHOREO CHANGES)

1. Get Rad Tools

-- If you don't already know, the site's pretty down. Here's an archive.org link for the tools: https://archive.org/details/rad-video-tools (would be free on the official site if it wasn't for broken site

2. Extract via Dolphin the game

-- Just rip entire game disc from your normal wfbs file.

3. Copy the existing routines

-- Good for later use in case of future use in MU's, etc.

-- Note that they will have backgrounds as a part of the .bik files.

4. Do your song edits AND export at the same original resolutions AT 60 FPS.

-- Any other FPS and it will be out of sync.

5. Use the RAD Video Tools to re-export as .bik.

-- Don't change any settings via RAD, just Bink It!

6. Make sure the codename is the same as the original then replace the original in the game files.

7. DONE!

Notes:

- I don't know how to change the choreo or pictos yet but it seems to use LiveMotion Pro to make the original choreo data.

- You can end shorter than normal and the routine will end early, but won't change point values so if you end it early, less points for you.