In an attempt to help me and the VX3 with unmasking this is what I do. I go into the kitchen and steal some plastic cups and containers ranging from 3-8inch's.deep Then I will place a quarter on the ground then turn the cup upside down over the quarter and place a nail on top of the cup.Then I fire the VX3 up and start playing with the adjustments. There are many variations on this like reversing the nail and quarter or placing one of them at different distances from the cup, the list of different ways to do this is long but I think I'm starting to benefit from what I've learned.I know , I really have too much time on my hands but..... HH