It was a feature added in by firmware upgrade 2.61. The older manuals may not
show this but the newer ones do. I keep a copy of the firmware upgrade list
handy. 73, John W2XS
KX2 MCU 2.61 / DSP 1.46, 5-31-2016
* AUDIO-CW USER INTERFACE IMPROVEMENTS: The KX2 can emit CW characters when
switches are pressed and knobs are turned, etc. For details, see the
document, “Elecraft KX2 Physical Description and Audio-CW User Interface.”
Audio-CW tones can be enabled in the menu (see MENU:SW TONE), or on
power-up, by holding APF along with RATE and A/B. Release RATE and A/B
first, then release APF. This sets the speed to 20 WPM. The menu entry
provides more speed selections.
--
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