Last summer we had a discussion with an Altahama's post about GB and then another issue appeared for modulation, well about GB I have a good solution for it. At first set your machine on auto track and let the detector to balance at that time it will be too noisy for a while till is GBalanced that will take maybe up to five minutes, I think this is why some guys in the forum gets tired with it cause they believe that the detector will never be GBalanced or V3i can't be GBalanced. Once it is GBalanced turn it to Locktrack, and thats all with this. It will be even with high gains and discrimination very quited. Now for modulation I do have no understanding. Is it for quitening deeper targets? cause to be honest I used it from 'off ' to 2 or higher setting and it didn't make any deference to me in the field and air testing. V3i can do much as I saw by far but I thought could it be something wrong with my software? Thanks in advance for any help.