Familiar with ear fatigue and in my recent frustrating experience is that tone has changed to something undesirable after recent update. Another possibility and maybe Line 6 can answer, is it possible the 'tone' chip was damaged somehow? and if so, how could we test it, better yet how much would it be to replace to absolutely make sure it's not that? My tone is now much harsher and missing all the warmth prior to update and cannot get back to that. I've come close, but it seems everything is overdriven. Sounds like metal on metal even on lightly overdriven tones???? I rarely go Full Metal, play a lot of church Hillsong stuff and just doesn't sound the same anymore. I've taken it to the repair shop after support told me to do so, only to find out they simply reset it. wish I was advised of that and save 100.00, I had the USB V 0.00 error that supposedly Line 6 had no advise for? Same gear, same patch,, head phones, amps, PA's, played with all the settings and still does not sound the same. Love the unit and it's flexibility, but could understand that something may have been damaged electronically that can't be easily detected. Help...