The Sunreach and ReDawn audiobooks on Audible have an intro/outro containing morse code. (mp3 audio, morse chart)
This is how I hear/copy it:
Kind of weird. Do you think there's any meaning to it, e.g. an acronym, or is it just all pure nonsense from a morse code paddle, used to make made to cool sound effects? I'm thinking the latter but thought I'd throw this out there because it's fun to think about.