So I have been working with the .at9 files of PS4 and the problem I am facing is that the .at9 files are inside FSB5 files, and the FSB Extractors don't have the proper header data for ATRAC9 files.
I have attached one of the extracted .at9 files (The header is placed by the FSB Extractor and is just a normal WAV header, not ATRAC9 header) and the original FSB file as the FSB Extractor does show information about the files.