Audition 5.5 supports batch process. You can use 1 process such as Normalize, Fade, De-Esser, Hard Limit, Raise pitch, Remove vocals, remove 60Hz hum or a couple others. then pick your format and sample type to save to.
You need to look in the software for Batch Process under the Edit menu.
Most software will perform similar process in one pass.
You can also record a series of actions as a Favorite, then apply this favorite during the Batch Process operation. This will allow you to chain multiple effects or edits into one item. From the menu bar, select Favorites > Start Recording Favorite... then perform your desired actions on one file. Select Favorites > Stop Recording Favorite... when done and give it a name. It will be saved into the Favorites list and can be applied manually to other individual files, or from the Batch Processing panel.