Thanks for the information!

So I can use the speaker dropdownlist to select a number which will reflect the order in which I launched the event?
EX:
DialogStartThreeSpeakerDialog("Dialog",_VICTIM,_GUARD,_Player);

In this case:
speaker1 = _VICTIM
speaker2 = _GUARD
speaker3 = _Player

I don't have time to try it out now but I'll definitely play around this tomorrow morning.