Hello All: I have a Icom 746 that is about 5 years old. It seems the USB has drifted upwards a bit sound wise compared to LSB. Can anyone tell me where the BFO settings are in the 746? Can I change the USB BFO setting without having to align other components? I do not have a service manual. But I do have all types of screwdrivers. Thanks, Sean - K3XT