What kind of fisher were you using on your DVD?
What were your settings?

This has been posted in many previous threads. It was my proto CZ-3D.

Grnd Bal = 10
Sens = 4.8
Volume = 2
Disc = 0 (all 4 tones)
Mode = 'Enhanced'

The DVD is not about any specific detector; rather, it's about "HOW" to hunt.