Hello everyone. I recently purchased the F75 and need a little advice from some experienced users. I am trying to find the differences in modes. I hunt alot of places that have coins also alot of places that have relics. Civil war relics. Mostly coins and jewelry. Which mode works best for coin shooting. I like the all metal motion mode, but i get so many signals that are in the iron area while coin shooting. I haven't used the Discrimination mode as much as I probably should, but did notice that you can eliminate the iron signals a little. When I took it out I had the disc set at 16, notch at 1 sensitivity at 55 tones on 3. In de mode. At what numbers do gold rings register at. What I wish I could find was a site where guys talk exclusively about the f75. I could learn a little more about the machine that is not covered in the manual. I saw a post where some one talked about High and low gain modes. I have found a few things, but at this point I feel like a fellow who is in the middle of a field, finds a wild mustang, jumps on its back and tries to ride it. This beast needs a little taming.!!!