Hagstrom KE-USBMX20 User Manual page 15

Matrix keypad interface
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When defining a macro, each action is either the press (make) or
release (break) of a key. In this example, the desired character for the
key is "#". In order to get this character, it must be entered the same
way as it would be manually typed on a keyboard.
The shift key will be "pressed" ("make"), then the "3" key is pressed.
At this point, both keys are being held down. In order to release them,
a "break" must be done for each key currently being held on. First
the "3" key is released, then the shift key. Before selecting a key, be
sure to check the "make" or "break" selection box above the keyboard
before the key, to achieve the desired press or release of the key.
When defining a macro, the key actions may be done when
the input is activated, "When Input Made", or when the key is
released "When Input Breaks", or at both events. Always be
sure to issue a "break" for any key in the macro sequence that
was activated with a "make". Failure to release keys will result
in a stuck key, which can affect all further key actions.
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