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Re:A new type of piano keyboard: The Seaboard by eric_h on Sunday March 10, 2013 @02:41PM (#5352930)
"if you can feel the string in your fretting hand vibrate on a fretted instrument, you're doing it wrong."

Generally the entire body of an acoustic guitar vibrates with the sound of a plucked string - the fretting hand (being the only hand currently attached to the guitar) would likely feel the vibration carrying from the body, through the neck of the guitar. It's faint, but nevertheless perceivable.

Re:A new type of piano keyboard: The Seaboard by triplesec on Sunday March 10, 2013 @09:16PM (#5354361)
furthermore, a non-fretted instrument such as the cello, violin, fretless bass etc does give you good haptic feedback.