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ANSWER: You set Tone Audio Frequency when designing or installing a program. Tone (Audio Frequency) controls the Audio Frequency of the tone that the detector sends to your ears.  Again set as soon as you know how, this is one of the most important facility in all three detector that allows you to set the Audio frequency of the Tone, because each human being can have a different hearing frequency, ranging from low to high, this facility allows you to select your own personal hearing frequency. Make sure Threshold tone is set correct before adjusting this facility, then take your time adjusting it, a correct setting makes for a much pleasanter detecting experience.  No again like Target Volume & Audio Threshold Tone there is no point in having a different setting of this facility for different programs, because you will be using the same ears, once you have selected a setting that you are happy with, and it is comfortable on your ears, stick with it and install it in every program you use. This facility works the same in the Eagle Spectrum, XLT, and DFX Detectors.

QUESTION: 
When do I use Audio Discrim on?

ANSWER:  You set Tone Audio Discrim on when designing or installing a program.  On audio Discrim gives an audio signal for all targets accepted by the Discrim circuitry, and nulls "i.e. goes quite" for all targets rejected by the Discrim circuitry as the loop passes over them. Only turn Audio Discrim off if you want to receive an audio signal for every metal targets the loop passes over. This is known as all metal mode, in all metal mode the Visual Discrim Identification screen will still be registering and displaying a plus number and a graph bar, between 0 and plus 95 to the right of the screen for any non-ferrous targets detected. Any minus numbers and graph bars being registered and displayed, between 0 and minus 95 to the left of the screen, for a ferrous target will depend on how far into the higher Minus Discrim numbers the Discrim circuitry has been set to accept.   Use Audio Discrim on, as a main setting for general Detecting, and sites with plenty of modern rubbish "i.e. foil silver paper etc"! Use all metal mode on loose freshly ploughed dry soil, sites where ferrous targets could be interesting, and in areas where the swing of the loop is restricted.  This facility works the same in the Eagle Spectrum, XLT, and DFX Detectors.

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