Decide and find which voice file you want to replace from the .wav files. It can take a a lot of time to find which file your actually looking for as not many are named with what card the files belong to.
Using Audacity, open the wav file, and then import the new audio clip you want to use. (Note: the new file you use has to be shorter or equal in length to the original file).
Using WWise, create a new project, go to 'Project' in the top left, then to 'Import Audio Files'. Click on 'Add files' and add your new .wav file. Next go back to 'Project' and click on 'Convert All Audio Files' and 'Convert'.
Still in WWise go to 'Project' and 'File Manager' and then right-click on the project-folder address and select 'Open Containing Folder'. Now in the folder open up .cache>Windows>SFX and your new .wem file will be there.
In UABE again open the vo file, and find the name of the file you're replacing. Go to plugins>import as .txt and select your newly renamed .txt file. Save the file as 'vo', and replace the original file in voicedata_en-us with it.