oh man you bastard, what a great deal, my rp50 cost like 4 times that new.
think you got a great piece of kit too i love my 50, everything i play comes from it, although the factory presets are a bit duff.
Can't help you much with the functions though as it seems to have a totally different design to the 50.
If you come up with any cool presets pm me the formula so i can try them out.