I read that some think setting a little modulation helps with iron falses. Would dialing in a slightly negative offset to ground tracking quieten iron down, especially; when the ground has excessive moisture without sacrificing good targets? This is one of the settings on the V3i that intriques me. I really don't fully understand its purpose and from what little info I've read about it, I'm to the point of experimenting. I notice the VX3 doesn't have this adjustment so maybe it's really not that important in tuning the V3i for optimum performance.