How to transpose 1 octave up/down on Melody 61 MKII?

Transpose (-+) function allows to increase/ decrease the pitch by a half-step. this means, I need to hit transpose (-+) button 12 times to go 1 octave up/down. However, it only allows to hit it 6 times (1/2 octave), and once it reaches 6 on the screen, I can't go higher/lower.

is there a way to transpose by a full step, not half-step on this keyboard?
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