Up and down buttons: can they be accessed?

ok,
well for presets a range 0-7 looks limited, but I understand the original idea was octave transposition.
As we do not have any other button to change presets, it would be great (IMHO) a bigger range or maybe, more capacitive buttons on the surface.

If not a solution would be using two hexagons, one for preset up and another for preset down. Or an encoder with a color feedback…