We bought these radios for listening to officials and announcers at dirt race tracks. We want to set them up to listen to UHF channel for officials talking to racers and also monitor an FM channel for general announcements. The FM channel should be predominate with the UHF channel cutting in when something is said. We had these radios set up correctly at one time by a friend but we screwed them up trying to change the FM channel for a different track. Maybe there is a complete reset we can do? Thanks for any help.