Interface CaptionEvent

A visual cue for a sound effect a deaf or hard-of-hearing player cannot hear - a footstep, a monster's growl, a door creaking. Dialogue already has its own on-screen text (mwg/stage's MessageBox is how every line is shown at all, not an addition over voiced audio), so this exists for Sound alone, not Music: background music is not ordinarily captioned the way an important sound effect is.