You want to use at least 3 tones because once you use the Discrimination the first tone becomes the Iron Volume at whatever level you have set that for. So if you have your Discrimination set to 8 the first tone you set will then be the tone you hear for any target from 0-8 then your second tone and so on. I use 4 tones. Where you make the breaks and what tone you assign are of course a personal choice.
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