Our Tricaster Mini that we've had for about 2 years has suddenly stopped inputing audio. We're we going from our sound board aux out straight to the Mini's Left and Right audio inputs. Up until a few days ago it was working fine. It starting cutting in and out and now it doesn't work at all. We have tried unplugging and plugging them back in, using both balanced and unbalanced cables, and even going from RCA out from our board to 1/4 inch input to the Mini. Nothing at all. We can't get audio from if we plug our source into the mic input on the Mini but we get a loud buzz/hum because it's a mic input and not line, and we're not able to choose line input. Any help we can get would be great. Thanks.