Did you know Without a Dawn supports external voice acting?
Use ogg format.
Create a folder named va in the game’s base folder.
Carefully follow the dialogue file structure:
Create a folder named part_01 inside the va folder.
Place your ogg files inside the part_01 folder. Name the ogg files following the dialogue file. For example, The line 1=Are you awake? file name should be 1.ogg.
Once you’re finished with part_01, create a new folder named part_02 and repeat.
I recommend leaving tenth of a second (100ms) of silence in the beginning of the ogg files.
Keeping a backup of your voice acting is a good idea!