Posted on 19 February 15 at 08:43
Have you tried to recalibrate via the menu and do the strumming test etc?
I have my 360 through my HDMI in on XB1 now, and when I played GH3 recently the timing was all over the place, but a calibration in the settings sorted it out.
It is pitch black. You are likely to be eaten by a grue.