connecting mini disc to mbox

[angelox8]

looking for help. New to the mBox. I have connected my portable sony minidisc to my Mbox using the source one and source two inputs. I believe I have connected it correctly. I made some test recordings but the levels were so low that I couldn't get a very good recording.

I adjusted the gain manually with the knobs on the front of the mbox but had hissing sounds if I went to high. The level of recording still wasn't that strong. I tryed a few different mini discs to see if I had a low level recording. The result was the same for all the different disc.

Is there something I'm missing, some way to up the gain in the program. The old pro tools I had I was able to go into the hardware adjustments and change the gain that way. Any help woud be appreciated.