Hi Dan.
I started hunting with the volume down at 4 yesterday so I could hear the whispering tick of deeper coins. I have not done this in all my years of hunting. I loved it. I went to an old fairgrounds that I have pounded for over 20 years. I have hunted it with an xlt...cz7...explorer2...and now my new cz70pro. I pulled out 3 more coins at 8" each. Two 1920's wheaties and a 1913 Barber dime. No matter what new detectors come out in the next 10 years...I will NEVER let go of my cz70pro. I was able to get the sensitivity to 6 without problems and I honestly have to say it made a nice difference. The barber sounded nice at 8" with the sens. at 4 but a little "iffy". When I hit the good but "iffy" signal I then moved the sensitivity to 6 and it sounded perfectly clear and ticked like a clock. Out popped the barber at 8". I would have dug the signal anyway...but it was a definate dig with the sens at 6...perfectly clear. I usually hunt with it at 4 like everyone recomends...but it made a noticable difference at 6.
Take care