Hi. New to the forum. I just installed the Lyric in my acoustic. Due to the lack of space, the mic was attached to the bridge behind the pins. I had read in past posts that this was ok. It sounds great but the only issue is I get a loud hum or buzz noise when I'm not playing or in between a short rest in a tune. I'm running my guitar through a Roland AC 60 acoustic amp. During a show this weekend, I was starting a song and the feedback hum was brutal. It kind of comes then goes then comes back again. Real frustrating. I thought maybe my monitor was a bit hot but when practicing at home it does the same thing. Seems like the strings get humming and the sound grows and get's worse. Any ideas ???