How do I make a piano like the one in "Big" and can I also make it light up?
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Make a cover that looks like a giant piano. Cut the mat into pieces that are slightly smaller than the cover. Glue the "switches" to a piece of plywood. Wire the switches. INterface the switches to your synthesizer. Put the cover over the switches and you're about finished.
For lighting up, I would just use LEDs, but I wouldn't include them all in the same circuit as you keyboard (you would have to adjust voltages, etc). Make each panel light up independently based on pressure switches.
For the keys, I would use plexiglass panels (frosted of course).
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