yes Hans, I know that need to change R according to the table from ke7xr.
thus, menu items 3.8; 4.8; 8.2 i make 500 Hz.
and menu items 8.3 Phase adj Lo freq: audio freq forlow audio phase adj (600Hz)
8.4 Phase adj Hi freq: audio freq for?high audio phase adj (800Hz)?leave the default values??or change accordingly by 400 and 600 Hz?
how right?