All this technobabble is beyond me. All I know is that when my Helix says my guitar is in tune, it is not correct, and I confirmed this by using other tuners. I can't tell you numbers-wise what the offset was, but it was enough that I was frequently finding myself out of tune with the rest of my band. If it's an issue of granularity, they having the option of increasing the granularity display would be most appreciated. Right now, its a bit of a pain and gives me tuning anxiety during gigs because it's enough that it's noticeable, so even after I tune, I usually have to tune by ear against my other guitarist to ensure that everything is good. I have neither the time nor the interest in doing extensive testing to identify or provide evidence of this issue. But it's an issue for sure. I just want to plug in, tune, and play. Never had a problem with my HD500 so I know Line6 can make a reliable tuner.