im using gh combined ferrous,, settings and digging mercs in heavy iron..around 6-7 inches. my problem is that the iron sound is so heavy that its tough to hear the high tones squeaking thru because they are faint or very short but they do show up on the screen. i have the iron tone set low and the silver tone set pretty high. if there was a way to quiet the iron tone but not turn it off it would really help. is there a way to do this without going out of combined??? or rejecting the ferrous all together. ive been diggin merc,s with 3 -4 pieces of iron in the hole. thanks for any insight into this situation. HH