Using the Pro 11 coil and my Heavy trash & Heavy Iron program that I'd been using lately in my latest post on 5 Keepers, I got a surprise out of it. First I used the Multi-Tone pattern and passed several of the Zincs over the coil and got nothing so I went to Edit and used the accept check mark on the right side. I ran 8 1943 Zincs across the center of the coil several times each, which opened up my FE35 line . With each pass of each coin several time I would get a different multiple tone which I thought to be very weird. These are all the FE35 numbers they came up at FE 35-CO 31,33,34,35 37,40,42,44,45 and 47 they would almost never repeat the same number 2 times in a row, the numbers on the CO always changed but the FE always stayed the same. Now for the next surprize, When I went to my TTF program of the same pattern and pasted 3 different coins over the coil all I got was a null. No tone whatsoever and the bottom of the pattern is completely open from CO30 To CO50 but when I passed 2 and 3 coins stacked on top of each other in 2TF I got a tone each time and with totally different FE and CO numbers all over the place but always with a High Tone. Does anyone wonder why they are so hard to find. So What I will do for now on is to hunt them only with my Multi-Tone Heavy trash and Heavy Iron pattern now that I've edited (open) my FE 35 line with the above CO numbers. The tones are weird enough that I'll never miss one using multi-tone when I'm hunting for my Keeper coins