Hi all...new to forum as I am also new to metal detecting. Just received my Simplex, going over the settings and I noticed something that I hope other owners can help me with. In the manual it says there are 5 Frequency Shift settings, F1 thru F5. In every YouTube video I've watched, that shows the settings of the Simplex, I've seen these 5 "F" settings. But on mine I have just 3 (F1, F2 & F3). Does anyone know why mine is just showing 3? Yes I've updated the firmware and running v2.68. Note