So i have a presonus FP10 and when i go to reamp a track all i get is a ton of high pitched feedback and noise, and under all of that i can slightly hear the track actually being reamped. Is this an impedance mismatch issue that a DI box should fix? Im using Cubase 5 and i solo whatever track im reamping, take a chord from the first line output of the fp10 and into the input on my engl fireball. and obviously have a mic recording that back into cubase. but as stated above all i get is tons of feedback thats not in the DI and im using a Noise Suppressor as well..