I know you can get feedback from loud volume, high gain and pickups aimed close to amp . At the church I play at, sometimes they put amp in another room and is mic'ed up. They dont allow me to go Direct to PA for i dont know what reason. We sometimes dont have any floor monitors but only a headphones with a mixer we can mess with. How can I get feedback from my amp without having any amp/speaker to be near by? I want to use only POD HD500 which I have, not the feedback boost pedal.

Thank you !!