+warpzone_fadestart: start distance of fading out the warpzone
+warpzone_fadeend: end distance of fading out the warpzone (if viewer is further, warpzone is not rendered at all)
+*/
+
+/*QUAKED target_music (1 0 0) (-8 -8 -8) (8 8 8)
+Background music target (when this is used, the cdtrack line in mapinfo must not be used, and there MUST be a default target_music).
+When triggered, the background music is switched to the given track.
+When targetname is not set, this is the default track of the map.
+-------- KEYS --------
+targetname: The name other entities can use to target this entity (when not set, this one is the default)
+noise: the music to play (as full sound file name)
+volume: the volume (default: 1)
+fade_time: fade-in time
+fade_rate: fade-out time
+lifetime: when set, the music created by this target is switched back to the default one when this time expires
+-------- SPAWNFLAGS --------
+START_OFF: the trigger is off initially