Hey right now i have a AVT 150 half stack and i am running a GFX-5 floorboard through it. I have a problem with one of my presets that i use for Dream Theater. If i try and palm mute just an open Low E i get this buzzing sound. For example in the beging of metropolis part 1 with the delay it is just open E and it it palm muted. When I do it i hear the buzzing sound and it sounds even worse with the delay. Can anyone help.