I want to make some logic_choreographed_scenes for GlaDOS's speech to play certain sound files. The logic_choreographed_scenes in the original maps are just sound files stacked up. How would I make these? Would I need to use face poser?

Also, there are only two scene files in the logic_choreographed_scene i'm trying to use.

Thanks.

It is not yet possible to create custom choreo scenes with mods running on Source Engine 2007 (Orange box).
However, here's how you're supposed to make them:

http://developer.valvesoftware.com/wiki/Choreography