so i had my little casio and one thing led to another and i found out that it goes down to C2 instead of what was previously thought. now i can play all these new songs in my room instead of going to the living room to play them on the upright. I'M SO HAPPY! C2 TO C6 YES! CASIO! AHHH! (laughing) i had to get that out of my system. :)