Build yourself some test sticks with paint stirs, just buy a bunch of different kinds of coins if you don't already have them, then build your program around what you are willing to give up. Knowing my area, and knowing that some coins just aren't here because they pre-date Phoenix, I can go out and find at least one silver, and many wheats on any given day. My favorite coins to find are nickels because they are a challenge with all the tabs. Tabs numbers usually jump around more than nickels do, so I get my share of nickels. (all of my nickels register between 60-64 on ID Norm) I know that I'm walking over some cool stuff in the ground, but I work really hard all week with a beat up old body. The last thing that I want to do is dig tons of trash.
I built my coins only program and put it in a spot directly next to Andy's Bottle Cap rejection program, then when I get a possible bottle cap, I pop onto this 4 Khz program, if the number jumps higher than it was in the 12 Khz program, it is a bottle cap, don't dig.
I built a really simple program that is just about fool proof for "coins only" on 12 Khz. Run "ID NORMAL" or the numbers will be wrong.
You can set your program any which way that you choose, but to eliminate trash (almost all trash) you can set your notches to the following:
Disc 10
Notch 10-58
2nd notch 65-88
This looks terrible on paper, but if you look at my photo attached, you will see that of all the coins, I'm only losing the following:
Flying Eagle cent from 1858
The half dime
1943 steel penny
The Indian Head Penny (registers same as zinc, no thanks)
Zinc pennies
Set your other perameters for your hunt.
Where I am, there is so much trash that I hunt with:
TX 1 (I don't need to go deep here, more power makes it harder to get clear target seperation between trash)
Sens 80 or less
Ground balance 2-3 higher than the actual ground that I'm hunting. This eliminates a lot of the little chirps.
Silencer: Plus 1
Reactivity 3 or more. The higher number, the slower I swing the coil.
I run "Full Tones" and keep my audio response up over 4 just so that I can hear deeper coins.
Hunting this way really quiets the machine, every now and then I bounce back to "Basic One" just to know how much garbage I'm stepping over.
If you think this is too restrictive, try it first. I usually dig a keeper every few minutes in a park that is said to be hunted out. Even with my power turned this far down, I've dug silver at about 7 inches that showed on the VDI. They don't allow anything larger than hand tools in this old park, so I don't want deep anyway.