From TF2 Wiki
Responses are a feature similar to voice commands, where your character may deliver a line of speech when a response rule is met. The difference is that while a taunt can be initiated with the press of a button by the player, these speech lines only play in reaction to the player completing a specific task, such as taking Intelligence, killing several opponents in a row, breaking an Engineer's buildings or killing an opponent with a specific weapon. Even when these rules are met, some of the speech files play only very rarely. Some response rules are common to all classes, while others may be specific to that class.
The Administrator also possesses responses that play when certain conditions are met, some of which occur 100% of the time (such as "You've failed!" on a match loss).
Accessing Response Rule Scripts
The scripts which control the responses are packaged inside the main TF2 .gcf content file. This file can be inspected with a tool such as GCFScape. The content file itself is located in the Steam\steamapps directory and is called "team fortress 2 content.gcf". Once you've got the content file open, the response rule scripts are located in root\tf\scripts\talker.
Script File Contents
The main script file is response_rules.txt. This file contains a description of the script language used by the responses, as well as definitions for most of the criteria used in the scripts. Additionally, there is one script file for each class. These files contain most of the class specific response rules and voice commands. Finally, tf.txt contains taunt rules for each class, as well as a few miscellaneous class-specific rules (such as rules to cause the Heavy to emote after firing his minigun for a while).
The result of a scripted action is usually a scene. A scene defines what is said as well as the expression on the character's face when it is said. Scenes are defined in individual .vcd files, which can be found packaged in the .gcf in root\tf\scenes\player\<class>.
There is one further level of abstraction between the response rule scripts and the actual sound spoken by the character. Scene files refer to a specific speech event, such as "Demoman.AutoCappedControlPoint03". These events are defined in root\tf\scripts\game_sounds_vo.txt and they refer to actual .wav files packaged in the .gcf (such as, for instance, demoman_autocappedcontrolpoint03.wav). The wave files are located in root\tf\sound\vo and root\tf\sound\vo\taunts.
In general, there is a direct mapping between the name of the scene (.vcd) file referred to in the response rules scripts and the name of the wave (.wav) file spoken by the character.
Responses by Class
- Scout responses
- Soldier responses
- Pyro responses
- Demoman responses
- Heavy responses
- Engineer responses
- Medic responses
- Sniper responses
- Spy responses
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