A thought just occured to me: For sound file purposes, a better thing would probably be to make a "short signal", because they would be shorter in length then a regular message.
Formatting for a short signal can be found here:
http://users.telenet.be/d.rijmenants/en/kurzsignale.htm
It looks like this:
BB
RDF QRLE ATMG SIKR ODX RDF
Where "BB" is actually a "Beta". I'm not sure of the Morse equivalent for Beta: I learned International Morse, and the extra four characters needed for Slavic languages, but I'm not familiar with the "Beta" character.
If anyone knows what it is, let me know and I'll create a short signal we can use.