Lots and lots of experimenting. I used the videos on YouTube for a bit, but I wasn't getting anywhere with those. Everything sounded the same, and almost every single one of them used the Modern Talking wave table, which is so over used it is sad. I've gotten to the point where I don't use any presets at all, not even my own. I like to have new sounds in every song I create. Even if I am shooting for the same type of sound, I try to vary it up just a bit each time.