Just a reminder to everyone out there, when using full tones, even though you can set iron volume, it actually has no effect.
Anything that would otherwise normally give a target ID in the discriminated range will be silent. Depending on where you set discrimination (6.1 is the default for Deus Fast if I recall) then "ferrous" above 6.1 will have a tone (still independent of iron volume setting) and anything below 6.1 will not be heard (regardless of iron volume setting). This, to me, is one of three minor drawbacks to using full tones (the others being ferrous "down averaging" of non-ferrous targets when using minimal discrimination, and the fact that you cannot set the full tone breakpoints - an advantage and a disadvantage). I am not saying "don't use full tones". I.e., no need for Toothpick to change up what he is doing and obviously being successful at. I just wanted to mention the little factoid about iron volume because I see it often listed as a setting when folks are laying out their full tone custom program settings.
However, where you set iron volume IS important if you use multi-tones and can be useful if you are using the technique of searching in a full tones custom program and then simply shifting to "multi-tones" or "pitch" mode by simply changing the "tones" expert setting on your custom full tones program (without changing the discrimination setting itself). Switching to multi-tones can help mitigate the down averaging issue (provided you are using discrimination) yet allows you to hear the iron using iron volume; and switching to pitch (which is basically "two tone" with iron volume as Tone 1 (below the disc breakpoint") and pitch as the non-ferrous umasking Tone 2). A very effective unmasking technique I have use to some limited success in iron infested sites. By simply switching the "tone" setting on your custom full tones program then you can save on your precious 7 custom program slots which tend to get used up for me because I like to set up clone custom programs for my most frequently use operating frequencies for both my LF and HF coils. For example, Slot 11 - Full Tones/No Disc 8 khz, Slot - 12 Full Tones/Disc 10, 8 Khz, Slot 13 - Full Tones/No Disc 12 khz, Slot 14 - Full Tones/Disc 10, 12 khz, Slot 15 - Full Tones/No Disc 10 28 khz, Slot 16 - Full Tones/Disc 10, 28 Khz, Slot 17 - Gold Field/No IAR 12 khz, Slot 18 - Gold Field/IAR=5, 12 khz. Note all programs that are less than 14 khz will default to 14 khz on the HF coil. The latter two GF programs I use for relic hunting under highly mineralized conditions (essentially all metal mode where I am just looking for a repeatable pitch tone with no iron reject). If I get a repeatable buzz then I shift over to IAR = 5 to see if the repeatable pitch tone breaks us indicating ferrous. Across the board I am typically running reactivity at 2 to 2.5.
I know a lot of extraneous information and sorry I hi-jacked your thread, Toothpick, but I just wanted to get the iron volume setting info out there for full tones and let people judge for themselves whether these other programs may be of use in high iron and/or high mineralization situations.