Hello supertraqer and welcome to the LST circle.
If you can't ground balance in "Normal Soil' with the 'Sensitivity' at 10 switch to 'Alkali' and if that doesn't work go to 'Black Sand.'
Pump the coil from about two to ten inches four or five times in quick succession. Keep playing with the 'Threshold' until you hear a soft but constant hum when you pump the coil. And, you are always supposed to hear a sound when in 'All metal' whether the coil is on the ground or in the air. A low hum.
I have many times turned the 'Sensitivity' all the way down to 1 as I turned the machine on to hunt in 'All Metal' and not ground balanced at all, because you don't have to ground balance at the setting of 1, and still found many, many very small targets.
My best advice to you as a new owner of a Lobo is to go to the nearest park and put your settings on 'Normal Soil,' the other toggle on 'Disc' and turn the 'Discrimination all the way to 10 [Max). Now you are ready to have some fun. Sooooo Simple.
I guarantee you will find way more favorable targets than junk. You will not get disillusioned, frustrated, and downright mad like so many have when they first start out because of the trash they must endure. Each time you head out you will feel confident in the fact that you will find worthwhile stuff and not a bag full of garbage to go with it.
As you hunt in the above setting you will hear chatter at times as you pass over junk but you will soon easily recognize the sound of coins and good targets. Run your coil over some different coins at home and you will know the sound. Get used to it, you are going to hear it often!
After you have had some fun like this for a while and are getting the hang of your LST then start playing with the discrimination. Your Lobo will be great partner and an asset in the field.
Good Luck
Cliffhanger