Two buttons, up and down or previous and next

I’d like to make a simple utility that allows to transpose pitch by one semitone in each direction using two buttons. So the central position is C and I’d like to go 12 semitones each way.

I was thinking of connecting both buttons to index of the MIDI N to 1 but obviously it only takes input from one knob.

Is there an elegant (simple) way of doing this?



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