I must be missing something simple, but I can't seem to get the K3 into ESSB. I go to the TX ESSB menu item with knob B in the Config menu. The A display shows "OFF X.X", where X.X is a BW number between 3.0 and 4.0. The A knob lets me change the BW number, but I can't toggle to "ON". What am I missing? Thanks, Phil NS7P