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  2. Free-bass system - Wikipedia

    en.wikipedia.org/wiki/Free-bass_system

    The system arranges the left-hand buttons so chromatic arrangement of keys, adjoining Circle-of-Fifths, chord inversions, and alternate chord voicings are available to the player simultaneously. A famous accordion musician and proponent of the advantages of the Moschino free-bass system was George Secor , and links to a more detailed ...

  3. Stradella bass system - Wikipedia

    en.wikipedia.org/wiki/Stradella_bass_system

    96-button Stradella bass layout on an accordion. C is in the middle of the root note row. The Stradella Bass System (sometimes called [1] standard bass) is a buttonboard layout equipped on the bass side of many accordions, which uses columns of buttons arranged in a circle of fifths; this places the principal major chords of a key (I, IV and V) in three adjacent columns.

  4. File:ANSI Keyboard Layout Diagram with Form Factor.svg

    en.wikipedia.org/wiki/File:ANSI_Keyboard_Layout...

    English: Correctly labeled modifier keys for the ANSI Keyboard layout. This diagram includes denotations for the common form factors for 60%, 80%, and 100% sized keyboards. Key sizes are also correct, relative to each other, based on the 1x model.

  5. Chromatic button accordion - Wikipedia

    en.wikipedia.org/wiki/Chromatic_button_accordion

    Chromatic button accordion; Classification: Free-reed aerophone: Playing range; Right-hand manual: The Russian bayan and chromatic button accordions have a much greater right-hand range in scientific pitch notation than an accordion with a piano keyboard: five octaves plus a minor third (written range = E2-G7, actual range = E1-D9, some have a 32 ft Register on the Treble to go even lower down ...

  6. Telephone keypad - Wikipedia

    en.wikipedia.org/wiki/Telephone_keypad

    [5] Meanwhile, a 1960 paper – just five years later – refers to today's common calculator layout as "the arrangement frequently found in ten-key adding machines". [3] In any case, Bell Labs' testing found that the telephone layout with 1, 2, and 3 on the top row, was slightly faster in use than the calculator layout with them in the bottom row.

  7. Keyboard layout - Wikipedia

    en.wikipedia.org/wiki/Keyboard_layout

    Visual layout is the arrangement of the legends (labels, markings, engravings) that appear on those keys. Functional layout is the arrangement of the key-meaning association or keyboard mapping, determined in software, of all the keys of a keyboard; it is this (rather than the legends) that determines the actual response to a key press.

  8. EurKEY - Wikipedia

    en.wikipedia.org/wiki/EurKEY

    EurKEY keyboard layout. EurKEY is a multilingual keyboard layout which is intended for Europeans, programmers and translators and was developed by Steffen Brüntjen and published under the GPL free software license. It is available for common desktop operating systems such as Windows, Mac OS X and Linux. [1]

  9. Mouse keys - Wikipedia

    en.wikipedia.org/wiki/Mouse_keys

    Mouse keys is a feature of some graphical user interfaces that uses the keyboard (especially numeric keypad) as a pointing device (usually replacing a mouse).Its roots lie in the earliest days of visual editors when line and column navigation was controlled with arrow keys.