AMC Javlin does a hood job of showing you.
1) Set detector to all metal mode. Sensitivity to 10
2) Turn on detector
3) Hold coil up and away from the ground, set threshold to a slight sound
Now bring the coil off the ground 12" or so, bob coil up and down to the ground.
Notice the sound the sound should be the same at 12" and the ground. If the sound is
louder when the coil reaches the ground, you need to decrease the GB by turning the GB knob
to the left. Keep bobbing and adjusting until the sound is the same. If the sound decreases, when
the coil is at ground level, turn the GB knob to the right. The object is to get the sound to be the same
off the ground and on the ground. Then turn the GB knob it slightly to the right for a slightly positive
balance.
You can download any Tesoro with GB, Vic., Eldorado, etc. will give instructions.
Because the Cibola is a motion machine you have to bob up and down quickly.
[video]http://www.youtube.com/watch?v=Yvkao8zEiuo[/video]