Hey guys im having an trouble , My pod hd 500 is having a lot of feedback, i use and marshall mg 100dfx and and ltd ec 1000 or and Gibson Std But in the LTD i have a gigant feedback , What can i do? i try to turn down the master volume of the hd 500 but this dosnt resolved the problem , Plz i need an help because i have and show who is comming near

Thanks you Guys