Jeff and I had a couple PM messages back and forth about Iron Bias, and what it does. Jeff made mention he thought it took items with mixed ferrous and non-ferrous responses and reduced or eliminated the non-ferrous response, leaving only the ferrous response. I usually set Iron Bias to 0 unless I forget and leave it at some default setting. I hunt full tones and between high 39 spikes and audio "tells" while in full tones I generally do not have much issue with ferrous tricking me, and so