Gunnar, I can tell you for the kn600 and kn 800 and maybe it works for the kn700?
Press the Memory & Control button. go to page 5 that is tune. You can tune from 427.3 to 453.0 Hz. You can also select Standard Piano Tuning or E. Tempera tuning.
In this window you adjust the pitch with buttons 1 and 2 and the modes with buttons 3 & 4.
Hope this helps.
BEBOP