This is Beach Guy, I hope you ment me on this, but I think I'm running in ferrous audio, but I'm ashamed, I don't remember, but I think the audios are distinctivly different so it could help you once you decern which is which. I usually run in low trash mode because I think it gets better accuracy and if it's a super trashy area I might bring out my 5" coil which seems to spearate the trash very well, albiet you can't cover as much ground in a given time, it's very selective on the targets and seems to go pretty deep. I think this audio thing can be pretty "tricky" in terms of differentiating"some" of the tones, but from what I've read in the past posts, it pays to practice much on it and try and learn the different sounds.