^ That article was an excellent read, thank you.
To the poster asking about the UX2, I use this interface too. The UX2 has Hi-Z inputs, along with a pad input for active pickups, and I have read in this forum that this should do the trick without needing a D.I. box. The article linked by Terminus will be of great help to you. I use some of Pod Farms pre-amps and its compressor to make D.I.'s. (Then pod farm is never used again in my recording chain lol) But I will be the first to admit am probably doing it all wrong!!