I recorded my wav file, made a .lip, and converted the wav to mp3. All of these files are in the correct path with the correct file name, in fact the CS will play the voice under the "edit response" window as it should. The mp3 has the correct frequency, bitrate, etc.
My NPC will not speak the line in game, and he will not lip sync.
So, I started trouble shooting.
I replaced a line and lip file from "Servant of the Dawn" with my own mp3 and lip file, and when I played "Servant of the Dawn," my line and lip file were used just fine. This verifies that my mp3 and lip file are not to blame.
I took a vanilla mp3 and lip file and overwrote my own mp3 and lip file for my mod. My NPC will not speak the vanilla lines either.
And lastly, universal silent voice is also ignored by the NPC...
So it appears my ESP file completely ignores the voice files...even when the CS verifies that they are in the correct path, and that the mp3 and lip files are all correctly formatted since other mods will use them without problems.
So....essentially, what on earth is going on here?