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2. Musical keyboard - Wikipedia

   en.wikipedia.org/wiki/Musical_keyboard

   Pressing a key on the keyboard makes the instrument produce sounds—either by mechanically striking a string or tine (acoustic and electric piano, clavichord), plucking a string (harpsichord), causing air to flow through a pipe organ, striking a bell , or activating an electronic circuit (synthesizer, digital piano, electronic keyboard).

3. Chiroplast - Wikipedia

   en.wikipedia.org/wiki/Chiroplast

   A chiroplast is an instrument to guide the hands and fingers of pupils in playing on the piano, invented and patented by Johann Bernhard Logier in 1814. [ 1 ] [ 2 ] The instrument was a device that placed the wrist, thumb and fingers of a hand above five consecutive white keys of a keyboard, to overcome the difficulty of retaining their proper ...

4. Wicki–Hayden note layout - Wikipedia

   en.wikipedia.org/wiki/Wicki–Hayden_note_layout

   Notes of each major scale are stacked on top of each other (in alternating rows of three and four notes), putting them closer together. The Wicki–Hayden note layout is a compact and logical musical keyboard layout designed for concertinas and bandoneons.

5. Action (piano) - Wikipedia

   en.wikipedia.org/wiki/Action_(piano)

   Manufacturers of electronic keyboards, synthesizers, and digital pianos have used various designs to recreate the feel of an acoustic piano. The simplest electronic keyboards, sometimes known as synth-action, use springs to restore each key to its resting position, similar in concept to a computer keyboard, but providing the least realism. [9]

6. Piano key frequencies - Wikipedia

   en.wikipedia.org/wiki/Piano_key_frequencies

   Values in bold are exact on an idealized standard piano. Keys shaded gray are rare and only appear on extended pianos. The normal 88 keys were numbered 1–88, with the extra low keys numbered 89–97 and the extra high keys numbered 98–108. A 108-key piano that extends from C 0 to B 8 was first built in 2018 by Stuart & Sons. [4]

7. Electronic keyboard - Wikipedia

   en.wikipedia.org/wiki/Electronic_keyboard

   Weighted keyboards indicate that some kind of effort has been made to give the keyboard more resistance and responsive feel similar to that of an acoustic piano. Semi-weighted keys is a term applied to keyboards with spring action like a non-weighted keyboard but that have extra weight added to the keys to give them more resistance and ...