I run into "out of range" notes quite often when converting styles from other keyboards, but mostly in the instrumentation. Solton X1 will usually have a hallmark "dink" in the guitar strum that reads as f6. It's an annoying sound and I usually just erase it since it isn't needed for the strum effect, but it can be lowered to an f4 if one wants the note to remain. I have no idea why a note was placed so high, but I suspect it probably happened during the conversion phase. It takes quite a bit of time to edit out these "dinks", but the end result is worth it. Usually if the drum sounds are messed up everything else is too, so it's not worth saving the style. Like Alec says, lowering or raising the octave range gives you access to these notes, but I can't figure out what anyone would want with them. Too low sounds like thunder and too high grates your nerves. Oh well.