Persona 4 Arena Ultimax (PS3) PAC BGM

[AyanamiRei0]

Hello there, I've been trying to figure out how to add custom music to this but I'm having no luck. I've already had a look into the PAC file it contains the MSF file size twice and two other things that I cannot figure out what they're looking for. The MSF format is ATRAC according to Foobar2000

I've already used the preexisting ArcSys script but that only allows for extracting not injecting.

If anyone can help me I'd greatly appreciate it

Here's a sample file

[aluigi]

I don't think exist rebuilders for the Arcsys format.

In theory there are some minimal chances in reimport mode but only if the size doesn't exceed the original one and if you use reimport.bat... very low chances.