Thank you Lee! Looking forward for the update
local soundID = getSoundId('vispath:path/to/narratortext.ogg')
setSoundProperty(soundID, {flags=1, volume=80}
@Sebastian: The current Lua sound engine uses the global sound volume channel for sounds played via it. You can tweak the volumes of the individual sound, but it will be x volume level percent of the global sound volume value.Maybe exactly what he needs?