Cyclerider

When I connect headphones to this jack it seems to work fine. But when I connect a cable to my iTrack solo interface for recording I get so much noise it's impossible to record. I've tried several different cables. At first I was using an unbalanced cable but then I read in the manual to use balanced (TRS). So I tried a cable that I use with my iPad which is balanced at the phones jack end and then splits into unbalanced left and right to plug into mic inputs for recording. Works great with the iPad but on this amp, it's just a lot of noise. Currently, I'm just putting a mic in front of the Spider and running that into a recording input and that works great, too. But it would nice if I could get a direct line-in. Does anybody have any thoughts? Thanks.