Foot controller with used computer keyboard chip. I’ve followed these instructions.
This work combines some dismantling, shopping, soldering, 3D printing, wood work and testing. No need to be heavy skilled in the fields.
The price of a used keyboard was 5eur, push (momentary) buttons were 2,09eur/piece, wood was 14eur, wires were 3eur; everything else was practically free since I own 3d printer.
Hupa Studio 
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