Windows Keyboard switch between C1 C2 C3

i ususlly play the keyboard on the bottom with my windows keyboard (ASD etc), so i have the mouse free to use, but its always playing in the same area, how can i switch between octaves, like C1 C2 etc?
Thanks in advance, great Synth!
cuTom Dittrix

X c and or v. Can’t remember exactly.

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Ok, i just found out, x is one octave up, y (z on german keyboards) is one octave down.