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(The back catch has no mark in the cut, but is explained below in connection with the "back check".) BC, is the back check which is simply a piece of wood with a thick piece of felt glued to the inner face and suspended on a wire. BCW, back check wire supporting the back check, and screwed to the wippen. The purpose of the back check is to ...
Keyboard expression is the ability of a keyboard musical instrument to change tone or other qualities of the sound in response to velocity, pressure or other variations in how the performer depresses the keys of the musical keyboard. Expression types include: Velocity sensitivity—how fast the key is pressed
Depressing a key raises its back end within the instrument, which in turn raises a mechanism with a small plectrum made from quill or plastic that plucks one or more strings. The strings are under tension on a soundboard , which is mounted in a wooden case; the soundboard amplifies the vibrations from the strings so that the listeners can hear it.
This is drawn schematically as a matrix of 8 columns and 8 rows of wires, with a switch at every intersection. The keyboard controller scans the columns. If a key has been pressed, the controller scans the rows, determines the row-column combination at which a key has been pressed, and generates the code corresponding to that key.
Almost all keyboards have only the switch (but no diode) at each intersection, which causes "ghost keys" and "key jamming" when multiple keys are pressed . Certain, often more expensive, keyboards have a diode between each intersection, allowing the keyboard microcontroller to accurately sense any number of simultaneous keys being pressed ...
The earliest known keyboard instrument was the Ancient Greek hydraulis, a type of pipe organ invented in the third century BC. [2] The keys were likely balanced and could be played with a light touch, as is clear from the reference in a Latin poem by Claudian (late 4th century), who says magna levi detrudens murmura tactu . . . intonet, that is "let him thunder forth as he presses out mighty ...
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Initially, the keyboard of an instrument such as a pipe organ or harpsichord could only produce sounds of one particular volume. In the 18th century, the pianoforte was invented. The pianoforte had metal strings which were struck by hammers which were activated by pressing or striking the keys.