I'm trying to reamp a DI guitar track but keep getting feedback. I set the output for the DI channel to Line Out 3 on my Studio 1810c, have it going through a reamp box and into my Hotrod deluxe. I have two mics on the amp that are going into input 1 and 2 respetively. Now, even when I mute those two tracks and have monitoring turned off I get feedback if I try to get anywhere around -24dbs on those tracks. Someone please tell me what I'm doing wrong!