I haven't really messed much with the etrac I bought a little over a year ago, but the other day I was playing with it a bit and noticed that there was no low tone sound for iron. Maybe I missed something in the settings, but it seemed like I either had a good tone on iron or no tone, depending on disc setting and tone selection. I know my xcal2 runs silently over iron in the water, but I like the way my 705 announces a low tone over iron.(unmistakable sound) Any thoughts?