KX-3

Hallo Winfried!
Ich habe den KX3 zwar nicht, aber im Manual steht auf Seite 30:

Switch press Tones

Switch press tones are enabled by default. Using the
SW TONE
menu entry, you can turn tones
OFF, ON
or select Morse code control tones at various
speeds (CODEnn). The full list of Morse code
control characters, as well as a text-only panel
description for blind operators, can be found on our
KX3 web page.
Switch tones use the CW sidetone volume level,
which can be adjusted in CW mode (pg. 12)

http://www.elecraft.com/manual/E740163%20KX3%20Owner's%20man%20Rev%20C5.pdf

73 udn schönes Wochenende!
Peter DL3NAA