JTV-59 green light on tuning knob? in James Tyler Variax Guitars / Workbench HD Posted August 14, 2014 Sounds like you got it into some sort of "save mode" or held down one of the knobs too long and it went into some sort of mode. If need be, and you want to get into a factory default set of settings, the re-Flash the unit using Monkey. Otherwise, your probably fine. I've serviced hundreds of these and the only time I see LED's light up in other than the usual colors, is when it's in some programming or save mode. Which is something I never need to use, since I use it as is and don't do much custom stuff. Sounds like you're okay now. Contact Line 6 support if that should change.