The format of speechName is [sound, maxTitlesDistance] or [sound, maxTitlesDistance, speed].
The unit will play the given sound.
If the unit is a person, it will also perform the corresponding lipsync effect.
If the camera is not within the given range, the title is not shown.
The sound is defined in the description.ext file.
If target is given, titles will be written to the conversation history.