I obviously have tons to learn and am not sure where to start but I have a problem in that I'm getting a digital sounding backlash/distortion after playing a note. If I turn down the input and output levels it goes away but so does most of the tone. I'm using a 50W stereo VHT into a stereo 4x12 with Scumbacks. Not sure what I'm doing wrong and not sure where to start to fix it? HELP!!!!