I can tell ya that if realband.ini didn't exist, Realband would't work .. except for the fact that RB will create a new (default) one if it doesn't exist, or gets renamed .. so it always exists!
The file is there. You just ain't seeing it.
Not seeing ANY ini files is what made me think it's hidden, as there are numerous .ini files in the Realband folder.

I do not work here, but the benefits are still awesome
Make your sound your own!