Scanning a handheld magnetic pickup back and forth over the piano strings makes a pretty neat sound. I may try attaching a rail on which the pickup can slide back and forth.
The pickup is plugged into an ordinary guitar amp.
Plug: Fun with Sensors workshop this Saturday at NYC Resistor!
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Hmm… And then have the sensor automatically move back and forth at high speed? Then perhaps disable the hammers and just have the keys operate the dampers? I think you might be on to something there.