Can you be more specific? I mean, is there a certain thing you don't understand?
A few tips I can add (although the Eagle SL II's varied a bit through their production years) is that they don't ground track good. So even though you have it set to auto-track, I never trusted it. This is because when using the two-tone mode, I could hear when I'd drifted positive or negative, and it wasn't tracking worth a durn. For this reason I learned to re-ground balance frequently. But this could be just a nuance of certain ones? Also this may be a mute point if the area you live in is flat, and minerals don't change much as you move around. Here in CA the mineralization can seem to change from one end of a park or school to the other side, and so forth. And same for the wet salt beach: Constant need to re-balance it whenever you walk further to, or further away, from the water's edge. It became second nature after awhile, since it was so obvious when that was needed, d/t the 2-tone mode (with all-metal in the background) giving the tell-tale signal that balance had drifted.
Another idiosyncrasy of the Eagle is that if you click & release the toggle, while in disc. mode, next to a metal object, you will be de-tuned to that amount of metal. Ie.: you won't rebound to full strength unless you hold your coil out in the air, and click away from all metals. Once again, this may be a peculiarity of some Eagles, but of the few I owned, this was true of each. But I kind of liked that feature, as it can be used to de-sensitize while in disc. mode, to sort of mimick switching to a small coil, with the flick of a switch, and then back again at will.
