Yes, it is a big problem.
I have found a WAY EASIER tutorial than the forums's one and all worked fine.
The problem is:
I have to create a New .sdat file with NDS editor.
I selected the source folder.
And then, the editor give me a...

0 bytes sound_data.sdat
Can someone explain how I have to fix that?

Edit: Already 10 hours without awnsers
Edit2: Thanks for everyone's awnser ' I have found another way: crystaltile.
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STEAM ID: Nymphali Festif | SKYPE: superrainboom

This forum is not for NSMB hacking stuff.
Closing thread.