How can I make this kind of instrument?
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answers
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Answer it!
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As far as the pickups go -- assuming that he isn't just miming to a preconstructed soundtrack -- I can see many ways to do it for vaying amounts of money and with varying behavior. The fact that he's calling it Sonar suggests that he *may* be using ultrasonic rangefinders.
First step is to figure out those pickups. That's going to take some experimentation; websearch for proximity sensors and Theremin circuits and so on.
Better solution, if you don't insist on the midair response (which is going to be a pain to set up and tune), is to get a standard MIDI drumkit.
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