Bruce,
I bought a Vaquero a while ago now and think that it is great! I did shell out for the 5.75 coil, it is a must for park hunting. I have just heard about this high tone thing and don't really know what it is.
I have never owned a metered unit, Garrett TA250 is the closest. My wife swings a PIV and it is neat having the TID on board and tones. BUT, and there is alwys but, if you want deep and clear or shallow and fast this unit does it. If I am out for a quick coin haul set the sense to 1 and fly. You will hit every coin your coil passes over that is 4 inches or shallower, I quick blip lets you know to recheck the beep. The Disc button has some real surprises for anyone who wants to bother to learn. See how cleanly square tabs knock out, no fading, just gone. With this knowledge I have never been wrong on a square tab, dig to prove and it is so!
I just want to know what this high tone is, is it a tone ID on the unit or a HIGHER audio RANGE, period?