Hi, I have bought my RP350 about a month ago now however I have never used the pitch shift. Well, i actually CANT use it. I tried some presets here uploaded on digitech such as the dethklok one which has a fourth down pitch shift, however, when I play on my guitar, no sound comes out of my amp, only when I untick the box on xedit would i be able to have some sound. seems as if everytime i try to use the pitch shift/whammy/chorus and others, my sound always gets muted. any help?