On the XT705, will the threshold only work in propecting mode? Does anyone use this mode to coinshoot? Seems to me this mode would probably be a little deeper than the coins mode. I may get the 705, think this mode would do very good on deeper coins. I have a clad quarter buried at 10", a nickle buried at 8", a penny buried at 7" and a clad dime also buried at 7". My XT50 with stock coil will hit all 4 coins with a soft repeatable tone with the quarter a little harder, I do believe the prospecting mode will probably hit them better, what do you guys think? Thanks and HH John