Piano Pedal
As my piano sheets always look like a mess, I just open the piano sheets as a PDF on my computer. The only problem is that at the end of a page you need to move your hands away from the piano to scroll down on the computer. So I build this little box to which one can connect multiple foot-pedals. Now I can just scroll through the sheets by pressing the pedals using my foot while keeping my hands on the piano.
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