Rubber contact strip for synthesizer keys, 12-note strip. This strip contains carbon contacts inside each "bubble". When a key is depressed, the key presses down on the bubble, and the carbon makes contact with the circuit board (the keyboard "contact board"). This type of strip has two contacts per note; one is to play the note itself, the other is to indicate the velocity at which the note was struck. Most keyboards use 12-note strips for each octave, with one 13-note strip at one end.
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