Also: I found the Russian manual on VK. “play sound” and “play music” don’t seem to work. Here’s my test code (placed on a terminal):
sound Sound Sounds/Test.wav
play sound Sound
play music Music/TestMusic.ogg
map return
They will only play in a cutscene. As soon as you leave the cutscene (which a terminal basically is) all played sounds and music will stop.
If you want to just play a sound, you need to use a trigger and then provide it with a sound.
I never got around doing something about this as this was purely for cutscenes.