ANSWER: Only turn Tone I D on in the field when detecting in Audio
Discrim and Silent Search modes. Providing Threshold tone is stable; or it will only add to the confusion if Threshold Tone is Erratic.
Recommend leave off when detecting on modern rubbish sites. On I think it increases the Detectors awareness to the smaller metal objects. Gives higher tones for iron and rubbish, lower tones for good targets, and mellow tones for small Roman, gold, and hammered coins. This one of those facilities you either love it or hate it "I love it"! This facility works the same in the Eagle Spectrum, XLT, and DFX Detectors.
QUESTION: When do I use VCO On?
ANSWER: Recommended set VCO to On when designing or installing a program. VCO Works well in both All Metal Mode and Mixed Mode Audio. It is also a very good aid for Pin Pointing in the Discrim modes, giving a high pitched tone when the centre of the loop is immediately over the target. A great Pin-pointing aid in all modes, when set around 45. When the trigger is pulled and held, it switches your detector into All Metal Mode, great for checking an area for any metal objects before making some of the other adjustments. It will also help the Manual Ground Balancing process when On. This facility works the same in the Eagle Spectrum, XLT, and DFX Detectors.