There is a tool called FSB Extractor with which you can explore and possibly export the audio files from FMOB audio banks. The saved MP3 files are typically saved in the %TEMP%\FsbExtractor\ folder upon extraction unless another folder is specified in the program settings.
Convert FMOD audio to Compressed audio and music file, mp3 songs or ringtones.
We found 2 software records in the database related to .fsb to .mp3 file format conversion.
Microsoft Windows software - convert fsb to mp3 on Windows
A simple program for extracting FSB files
Convert from fsb file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned fsb to mp3. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
An extractor for FSB audio files