I want each each character to have different themes

[Goldenhog]

I'm editing the source code, but I can't find a way to make each character to have a custom Level Clear, Game Over, 1-Up, Invencibility, Super, Continue and Credits themes, like Sonic Megamix.
Is there a way?

 

[MechaS3K]

Depends on how much work you want to do, and this topic belongs in Editing Help I think.