So I really want to replace the bcstm files in New Leaf to the Gamecube music. I already have the bcstm files and need to know how to put it in. I have some experience with Wii hacking but am new to 3DS Homebrew. So a few questions I have Is there any thing like Gecko OS for the 3DS? If not what should I use? Will this app permanently replace the music? And can I have a text tutorial on his to do this? PS: I did try figuring this out on my own but I haven't really found a clear tutorial for this.