There are several sets that need to be made for each character, each set corresponds to the current mood of the npc towards the player, there are also transitions from one mood to another, for example if you are talking to a NPC who is neutral towards you and you insult them you will see there mood change to an angry face.
Most can be restored via game mods, but are still silent. This Tutorial only deals with the art aspect of the process. A few, such as John Cassidy from Fallout 2, had Talking Heads animated but no voice-acting recorded (mostly due to looming deadlines), and were thus left out. These are master.dat, critter.dat, and if youve patched your. Before you do anything modding-wise, its expected that youve already unpacked three Fallout 2.
To use talking heads in game you need the artwork, the audio files and the Lip sync files, then the heads need to be scripted into the game. This tutorial should cover something that those in the know, when it comes to Fallout editing, often forget to tell you when you take your first steps into their world.