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Your questions led me to think.....what of having a kitten play inside the (open) piano? Not very reasonable/ sensible I suppose, but you could or might get: plucking and scraping, and some damping of course; all uncontrolled/ unexpected/ unpredictable. It might curl up and do nothing -- blocking off a set of strings....But with a live video feed to a screen, an audience might enjoy the experiment visually too. Use whatever loopers you prefer......