Start the Editor.
Choose Stratis.
Insert a Rifleman AT as Player (BLUFOR/Blue/Men/Rifleman (AT)).
Insert a Trigger away from player that activates on BLUFOR entering area
Group the trigger to the Player rifleman
In the "On Act." script for the trigger, paste:
playSound3D ["a3\sounds_f\weapons\Rockets\explosion_missile_04.wav", player];
sleep 10;
playSound3D ["a3\sounds_f\weapons\Rockets\explosion_missile_05.wav", player];
Launch scenario, walk into the trigger area.
Expected it to play the sounds separated by 10 seconds. It plays the first, but never the second.