Yet another at3+ encoder/decoder

[freefive]

Thanks to serio.
It's inside the PGD file of Fate/Extra CCC (NPJH50505)

PLEASE NOTE THAT WE DO NOT SUPPORT OR ENDORSE PIRACY. SO DON'T ASK FOR UPLOAD OR ANY KIND OF REDISTRIBUTION. IF YOU WANT THIS GAME, GO BUY IT YOURSELF.

If you have the ISO file , use JPCSP or other tools to decrypt the PGD then unpack the cpk, namely the decrypted PGD file, and you should find "at3tool.exe" under the sound/bgm/decode/ folder.