3 tone disc on 0 (zero), silencer on ii ground at 1 o'clock, Iron at 11 oclock, hold the machine at waist level turn sens fully clockwise listen to chirping sounds now turn sens anti-clockwise slowly until the chirping stops. then slowly lower the coil to the ground machine is now air & ground balanced.
Iron will spit or give out a low growl or both, deep large iron will be loud and then silent buckles / buttons / copper coins will be medium sound silver / gold / hammereds will give out high pitch sound.
Machine is in all metal mode with 3 tone sounds to distinguish what to dig or not to dig. This increases the depth and sensitivity to hammereds.
Thanks again to Mike for these settings