Just testing out Japanese voices for Borderlands 2 for my Mechromancer playthrough. Some voices are better and some are worse. Changing between English and Japanese language is quite easy:

1. Right click Borderlands 2 in your Game Library (In Steam)
2. Click Properties
3. Click the Language tab
4. Select Japanese (日本語)
5. Let the game patch and update. ***Do not run the game yet.***
6. Navigate to:
/%DIRECTORY WHERE STEAM IS INSTALLED%/Steam/SteamApps/common/Borderlands 2/WillowGame/CookedPCConsole/
7. In this directory you should see a "Japanese" folder. ***IMPORTANT: Duplicate this folder by copy/pasting it and renaming it to whatever you would like. (I named mine Japanese_2) You should now have two copies of the Japanese audio voice over folders. IF YOU FAIL TO DO THIS STEP, you will not be able to hear NPCs.***
8. Go back to the Language tab for Borderlands 2 in Steam and change the language back to English.
9. Let the game patch and update. ***Do not run the game yet.***
10. Navigate back to the /CookedPCConsole/ folder in step 6.
11. Copy the Japanese audio voice files you previously made a copy of (From step 7) back into the "Japanese" folder. In my case, I moved the files from "Japanese_2" back into "Japanese"
12. Navigate to:
Documents/My Games/Borderlands 2/WillowGame/Config/
13. In this directory you should see a file called "WillowEngine.ini". Open it in notepad.
14. Locate the following lines:

WwiseLanguageEquivalent_INT=English(US)
WwiseLanguageEquivalent_DEU=German
WwiseLanguageEquivalent_ESN=Spanish(Spain)
WwiseLanguageEquivalent_JPN=Japanese
WwiseLanguageEquivalent_FRA=French(France)
WwiseLanguageEquivalent_ITA=Italian

15. Change these to:

WwiseLanguageEquivalent_INT=Japanese
WwiseLanguageEquivalent_DEU=German
WwiseLanguageEquivalent_ESN=Spanish(Spain)
WwiseLanguageEquivalent_JPN=English(US)
WwiseLanguageEquivalent_FRA=French(France)
WwiseLanguageEquivalent_ITA=Italian

16. Save the file.

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