Audio middleware allows the audio people to work without need of much, if any, programming. Middleware will save you programmer hours by letting the audio team implement and program the audio themselves. It also allows them to mix and tweak the sound in-game, handles any conversion to the files and allows the team to more easily add/change events in the future (i.e. new localizations or platforms). If your project is not big budget the software will most likely be completely free to use as well, so it may be a very worthwhile thing to have.