Then open the "Citadel" file. If you got a MP3 player, join all files named "al_stuggle" together and also the two files "al_success_yes_nr" and "al_success_yes02_nr". Play it. There are, for me, some special effects. However, it is important for you to imagine a bit.
Of course you can add other alyx's voice files if you think they are suitable.