The manual for the MXT states that in relic mode, with the trigger in the center position is a "mixed mode", meaning both all metal and discriminate. Is there just an "all metal" mode on the MXT? Or is it only on with the "mixed mode?" If I hunt in the relic mode with "0" discrimination and trigger in the center, would that be a true "all metal" mode on the MXT? I'm guessing it would be, but I'd like to hear from folks with the experience.