Tools i used :
- wwiseutil used to inspect, extract and modify .bnk *
- vgmstream to unpack .wem to .wav **
- audacity to convert other files (mp3) to .wav
- wwise to repack .wav back to .wem


Content\WwiseAudio\Windows\RTG.bnk


1. Open RTG.bnk with wwiseutil
2. Extract all .wem
3. Unpack all .wem with vgmstream. Drag n drop onto test.exe.
4. Listen to and locate files you want.
In my case 07.wem ID 408208525 and 16.wem ID 896275896. At the time used bnkextr.exe so i didnt had the information that 07 and 16 were looping which you can see with wwiseutil.
5. Use audacity to convert blank_audio.mp3 to .wav
6. Use wwise to repack blank_audio.wav into blank_audio.wem. ***
7. Use wwiseutil GUI to replace 07.wem and 16.wem with blank_audio.wem.
8. IMPORTENT save as new RTG.bnk do not overwrite the file you have open with wwiseutil. *
9. We done.







Man that was a painful process of figuring everything out, especially if you dont know what you are doing hehe. There probably is a better way to go about this but this is how i managed to do it.

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* This software is a little buggy. Make sure to never save as > replace  file that you have open with wwiseutil. This causes the file to get corrupted, always save as new .bnk

** I was unsuccessful in unpacking .wem files with ww2ogg as instructed by wwiseutil readme which lead me to this issue page. Idk if i was doing something wrong with ww2ogg cant tell cause im noob.  :|


additional files and sites i went trough : 
- drag and drop .bnk on to bnkextr.exe for quick extraction.
- Monkeyman BNK Compiler can compile .wem to .bnk. Extract .bnk with .hirc file and .wem with original ids. Direct DL link: http://puu.sh/xcDcD/2ecc9d7c1d.zip
- Monkeyman BNK Compiler how to > https://nmsmodding.fandom.com/wiki/Replacing_Audio 
- https://forums.nexusmods.com/index.php?/topic/7907413-tutorial-modding-style-announcer-files/
- YouTube: How to Convert BNK to WEM to OGG
- *** YouTube: Converting Wav to Wem with WWise 
- https://forums.ageofempires.com/t/modding-anyone-have-a-clue-on-how-to-edit-sound-files-for-aoe2-de/61651
- https://github.com/hpxro7/wwiseutil/wiki/Modding-MH:W
- https://residentevilmodding.boards.net/thread/10291/methods-on-editing-audio-files
- https://www.reddit.com/r/killingfloor/comments/35d5w6/how_to_extract_game_audio_files_guide/
- https://github.com/Nexusphobiker/BNK-Editor
- https://github.com/anars/blank-audio