Maybe there's nothing so terrifying in the world as the long, few seconds that tick down when acharacter hears a strange sound behind a door and approaches it.
Today, most players perform Bigaglia's sonata on a soprano recorder, but we wanted a more extreme sound suitable for the dramatic character of the music.
Watching the same show with Speech Enhancement made Dame Maggie Smith's character's words louder than the background music and other sound in a scene, so we didn't have to strain to hear.