Anderton
How about "SPlat"? 
I tend to put the Sonar version name after each song name in the file name. Helps me to know what version of the software I was using at the time.
My current choice is PL15. I figure it's annual, so I might as well put a number on it.
Example file name: Totally Hot Song PL15 rev1a. My next Save As for the file will be: Totally Hot Song PL15 rev1b