I am sure it has to do with the way Tesoro circuitry works. They must use different electronics and because of the way its done it cant be achieved (electronically). Now maybe the next machine they come out with will be a new "platform" and have radically different electronics, who knows? James didnt go into details when I asked about this back when the Cortes first came out. I was lucky to be picked to test is so I was privy to a lot the details of it before it was actually released. I remember pointing out to him that the Cortes would be an even better machine if they could attach the GB to disc mode. But, the good part is that the ID screen works in the all metal mode, so you can hunt in all metal with a manual GB as needed. On very weak signals, especially ones showing some depth, I would switch to all metal to a little extra depth out of the Cortes. Often the deep targets, you know the ones that are right at the machines capability limits, just dont have enough oomph to accurately register on the meter. Quite often good targets will read as iron on the meter, just becuase its such a weak signal. Switching to all metal mode and checking it often times gives the machine enough additional info to better ID the target. Or at least give ME enough additional info so I can decide if I want to dig it or not.
