I just recently purchased a used XTi 4000 (yesterday). When i cut it on the LED read " PRESET 20 ". there were no DSP icons lit. QUESTION: I'm i looking at a Factory Preset? if so, how do i find out what the paramaters are? and how do i restore this amp to it's original Factor Settings (eg. like it came from the Factory)? Finally , what are the other Factory Presets?