This is a CLI tool. Running the executable as-is by double-clicking will not work.
PAYDAY 2 uses the existing_banks.banksinfo file to reference files that Wwise needs to keep track of. These are soundbank files and stream files.

By extension, modifying this file with the path to a custom soundbank (created with Wwise 2013.2, and loaded with BeardLib/SuperBLT) will make that soundbank's events available, provided it has been loaded. Adding custom streams is possible too.

A major downside to using custom soundbanks to play sounds is that only a single variant of the file can exist at a time; this means that multiple mods overriding the file will break each other. If future updates to the game modify the Wwise project, you'll also need to update your mod's file for the new sounds to play.