Hi All While we talking about tuning, I have observed on my GPX 4000 that tuning can, and does affect target response. When I tune (manually) while hunting, to get rid of EMI I have lost little targets. I was in an area where there was a few little dinks. I found a few and got what I thought was another but got some EMI creeping in, so I tuned a little to quiet down the detector, and could not find the signal again. So I reset the tune to the previous number and could here it again. So I dug it and found a little .4 gm dink about 3" down on some bedrock. Can you guys tell me why that is? Perhaps I need to send it to ML for a tune up? I checked this out twice and both times I lost the signal and could not find it with the detector tuned to it quietest setting for that target. Keeper swinging. CH