Definition of "keyer" []

• One who, or that which, keys. (noun)
• A device for signalling by pressing keys or switches. (noun)

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• "There is even the free cinegobs keyer, which is quite good."
• "I want to develop these to build a head-mounted display with an LED torch built in, a wrist-mounted display with a chord keyer inside, and a modular central unit to go in an inside pocket with central processing, storage, power supply, and interfaces in."
• "Not just a straight line, like a nice keyer would do."