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The matrix circuit approach used in musical keyboards is also used in other types of non-musical keyboards, such as in the keypads for calculators and the "QWERTY" alphabetic and numeric keyboards used to enter information into computers.
Matrix circuits for instruments that are intended to be used in a [[monophony|monophonic]] fashion (playing only one note at a time) such as a bass [[pedal keyboard]] are simpler than matrix circuits for instruments that will be used to play [[polyphony|polyphonically]] (multiple notes at once). For keyboards that will be used to play multiple-note chords or multiple-part melodies, the matrix circuit needs to have a diode soldered into the circuit for each key. The [[diode]] acts like a one-way valve in a water plumbing system. Without the diodes, the current would flow "backwards" up the matrix when several keys were pressed at once, which would trigger unwanted notes ("phantom keys") or mask intended notes ([[Keyboard_keys#Control_processor | "phantom key blocking"]).
==References==
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