Available Mechwarrior 4 Mission Script Methods - HelmMemoryCore/Mechwarrior-4-ModdingTools GitHub Wiki
Unless we get access to the source code of Mechwarrior 4 Vengeance / Black Knight / Mercenaries, a lot of the methods named below requires a bit a guesswork. For the most part, if you copy and paste existing script methods and adjust them slightly, you should be able to get them working.
PlayVoiceOverOnce(string filePath, int globalCharacter);
Examples:
PlayVoiceOver("VO\OP3\MI1\Alpha",talker_PI4);
PlayVoiceOver("VO\OP3\MI1\Alpha",talker_Ian);
PlayVoiceOver("VO\OP3\MI1\AlphaDead",Talker_Rat);
PlayVoiceOverOnce(string filePath, int number)
StartMusic(string filePath, float fadeIn, float fadeOut, int ambientDelay);
Examples:
StartMusic("Music\Sander",3.5,3.0,50);