went out detecting yesterday with a friend, now at the start of the day when we got close to one another my machine was going apeshit with electrical chatter feedback from his goldmax 18khz machine i could not get closer than about 15-20 feet away i had my machine set up in 3 tone mode .later in the afternoon i was playing around with my settings as you do ,and switched to DP mode interference cured instantly i could now detect to within a couple of feet away without a problem .i don't know if this will work with other machines yet or electric fences/pylons but its worth looking into .also if it does work it changes this into a detecting rally useable machine .