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Another way to have multiple octaves would be to use the arrow keys to go up or down and use the same note keys to play the notes. That way you aren't as limited to how high or low you can go, and (I'm assuming) you can mathematically change the octave.
Turn the calc sideways, and press any of the keys from [2ND] to [STO>]They're both C's, so [ALPHA] would be D, [MATH] would be E, etc...If you press the left and right arrows (well, actually up and down from the sideways perspective), the range goes up and down by an octave (indicated by the number on the screen.