go to apogee's website. Download the manual. There is a detailed picture and desciption on how to change the jumpers to low gain. Very easy. Might take all of 10minutes the first time to read it, crack open the mme and change the jumpers.
To run line in and bypass the gain stage, keep the level knobs clicked off. Use a jewelers screwdrive to adjust trim on the tiny inlayed screws next to gain pots. Otherwise, apply gain to use the pre's
ohh and plustee on taping the rads