Sounds Modifying a sound bank file?

[TheMightyMat]

I would like to modify a sound bank file to replace only one of the sounds in it - The rest of the sounds are perfect, but it's missing one (this is a modified sound pack).

I tried extracting the sounds using the FSB Extractor tool so I could re-import it into FMOD and change the sound I wanted, however the file types are Vorbix and have no header information, which means the extracted files are unplayable. Is there any way around this?