I am still learning my Excal 1000. I have had success with it and have been pleased with how it tones when I have a good target beneath it. BUT,,, the last two times out with it. I am getting constant tones and especially on the reverse swing on each end of my sweep. I used to occasionally get that, but now it seems constant. I am beeping in the same waters, so I now it can't be that many new targets. It tones as if I'm sweep over a bed of nails, one right after another. I have tried numerous settings. I have best luck with Sens/auto, volume to my comfort, threshold/barely aud. I have tried the 11-12 o'clock routine with backing off a little at a time but have had no luck. Just lots of tones, driving me nuts. Any one know what I'm doing wrong??