If a (musical) keyboard supports aftertouch, it has the ability to process, send, or receive pressure information while a key is being pressed.

This allows the patch programmer to create sounds that morph according to a method of user input that is a much more intuitive than a joystick or a mod wheel.

An example of a non-electronic keyboard that is aftertouch-sensitive is the clavichord. (I wrote clavinet before. Whoops!)

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