Hay Darod,
I got a CZ7 a few weeks ago. I'm not sure how different the two machines are, but here's my input from my experience so far:
I have highly mineralized soil so keep that in mind
In parks and trashy areas I run sensitivity at 6 or 8 usually. Sometimes that is still too high when I'm in lots of hot rocks, and I might turn it down momentarily.
Sometimes I notch out foil and pulltabs if I'm in a lot of trash and not really looking for gold. I leave Iron in because the CZ likes to give a false coin signal on rusty iron sometimes, and hearing the iron beep alternate with the coin beep helps me to decide whether or not to dig a target.
On the beach (only went once), I seemed to do fine with the sensitivity turned all the way up and I notched out iron, left everything else on.
I also turn the volume down to 4 so that I can determine the depth of a signal by the beep. I think most if not all CZs have audio boost for faint signals, so deep faint targets supposedly sound off loud and clear. This is defeated if you turn the volume down. Not sure if that's good or bad really, but I'm trying to find old coins so the faint beep is more what I'm looking for.
Keep in mind that I am a newbie to this machine too, and still haven't found any deep silver, so my advice may not be worth a plugged nickel.
