ROM Hack Replacing English audio with Japanese audio?

[Hyoga]

The game I'm specifically wondering about is #0856 "Bleach 2nd Kokui Hirameku Requiem" and its American counterpart #2761 "Bleach: Dark Souls".

I read on a different forum that it is possible to unpack the audio of the roms and repack a rom with the audio of the other version. So unpack both roms and repack the American rom with the Japanese audio instead of the English audio.

The person on that forum didn't explain how one could do this and I figured that if this is really possible, someone here would definitely know.

So, if this really can be done, is there someone who knows how and could explain to me how to do it?

I'm just not a fan of the English dubs, but at the same time I can't read Japanese.

 

[Raven Darkheart]

its easy
unpack the roms and swap the sdats and repack

 

[Hyoga]

How do I go about unpacking and repacking the roms? I'm assuming there's a program that I need to download?

 

[Raven Darkheart]

How do I go about unpacking and repacking the roms? I'm assuming there's a program that I need to download?

use the search function
there are posts littered here telling you what tools to use in unpacking

 

[Hyoga]

Alright, so the search function wasn't quite as direct as one would hope, but I went ahead and got the DSLazy and did exactly as you said, Raven, and it all worked perfectly. So thanks a lot for the help.

While I'm here, I might as well ask since the search didn't turn out anything useful aside from TWEWY:

Replacing music files.

There are a lot of games I would like to do this to. Replace some terrible music with a good one.
From what I've read the replacement song needs to be in the same format as the original song.
What else needs to be done to ensure the replacement will work - file size, duration? And how/where do I locate the unpacked music files? Like, what are the formats I should be on the lookout for when searching for the music files, or what are the usual folders they are in? In the case of Bleach: Dark Souls, for example, it doesn't seem like everything is in the sdat folder. Or in the case of Jump Ultimate Stars, there is no sdat folder, only a Sound folder; but that folder only has one file in it... how would I replace specific songs that case?

 

[Raven Darkheart]

hmmmmm edit
music swapper?

im not sure maybe one of the hackers can help