Ok so I added a memory toy to my board about a month or so back. When I bought the thing it worked great. Now suddenly whenever I turn it on, it makes a horrific screeching sound. Now the pedal has done this at all of my practices except for when I first bought it, and my second to last one. The only thing that I think was different at those two practices was that I was the only one playing at the time. Again I don't know if that has anything to do with it or not. So any ideas on what the problem could be?