This tool lets you view and edit the contents of the game's soundbank (.bnk) files. It can extract and convert embedded streams and import wav files to replace sounds. It also allows to convert loose audio files from wav to stream and the other way around.
It also includes a tool that lets you tweak the volume of sounds referenced by the opened soundbank (embedded or external) which is more effective than tweaking individual sounds manually as well as a tool to increase the sound limit which controls how many sounds can be played simultaneously.

Please note that the tool makes use of wwise_ima_adpcm.exe (which is included) to convert streams so the same limitations as with other available tools apply (Some stream files use a format wwise_ima_adpcm.exe can't convert).

You can also find this tool on GitHub, so if you want to help with anything, feel free to fork the project, make changes and create a pull request when you're done.