I have an early model of this pre amp / processor which I use for late night and quiet fiddling around. The other day while using it I spun the data knob to change presets, and it locked up. No display in red indicating the preset number, and the display just reads the Digitech banner, I tried a hard start according to the manual, and no luck. Is it toast? I hate to invest a lot of dough into it, I got it on the cheap, and use it occasionally, but still its kinda cool to have. Can anyone shed some light on what may be wrong?