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  2. Media control symbols - Wikipedia

    en.wikipedia.org/wiki/Media_control_symbols

    Media controls on a multimedia keyboard. From top; left to right: skip backward, skip forward, stop, play/pause. Media control symbols are commonly found on both software and physical media players, remote controls, and multimedia keyboards. Their application is described in ISO/IEC 18035. [1]

  3. Button accordion - Wikipedia

    en.wikipedia.org/wiki/Button_accordion

    The press of a button or key opens a valve to allow air to pass through the reed or reeds to make a sound when the bellows are pumped in or out. In the diatonic button accordion, reeds are fixed in pairs so that one note sounds when air moves in, and a different one when air moves out. [1] The button accordion has melodic notes on one side of ...

  4. Accordion reed ranks and switches - Wikipedia

    en.wikipedia.org/wiki/Accordion_reed_ranks_and...

    Accordion reed ranks and switches. Right-hand manual register switches. This accordion has three different voices. Accordion reed ranks with closeup of reeds. A reed rank inside an accordion is a single full set of the reeds that are the means to achieve the instrument's sound range. These reed ranks are located in the reed chamber.

  5. Telephone keypad - Wikipedia

    en.wikipedia.org/wiki/Telephone_keypad

    A telephone keypad using the ITU E.161 standard. A telephone keypad is a keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number. It was standardized when the dual-tone multi-frequency signaling (DTMF) system was developed in the Bell System in the United States in the 1960s that replaced ...

  6. Digital accordion - Wikipedia

    en.wikipedia.org/wiki/Digital_accordion

    The bank of electronic switches can change the accordion's sound, tone and volume. A digital accordion is an electronic musical instrument that uses the control features of a traditional accordion (bellows, bass buttons for the left hand, and a small piano-style keyboard (or buttons) for the right hand, and register switches) to trigger a ...

  7. Accordion - Wikipedia

    en.wikipedia.org/wiki/Accordion

    A digital accordion can have hundreds of sounds, which can include different types of accordions and even non-accordion sounds, such as pipe organ, piano, or guitar. Sensors are used on the buttons and keys, such as magnetic reed switches. Sensors are also used on the bellows to transmit the pushing and pulling of the bellows to the sound module.

  8. Diatonic button accordion - Wikipedia

    en.wikipedia.org/wiki/Diatonic_button_accordion

    A melodeon or diatonic button accordion is a member of the free-reed aerophone family of musical instruments. It is a type of button accordion on which the melody -side keyboard contains one or more rows of buttons, with each row producing the notes of a single diatonic scale. The buttons on the bass -side keyboard are most commonly arranged in ...

  9. Push-button telephone - Wikipedia

    en.wikipedia.org/wiki/Push-button_telephone

    A push-button telephone is a telephone that has buttons or keys for dialing a telephone number, in contrast to a rotary dial used in earlier telephones.. Western Electric experimented as early as 1941 with methods of using mechanically activated reeds to produce two tones for each of the ten digits and by the late 1940s such technology was field-tested in a No. 5 Crossbar switching system in ...

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