I own a Laney 100 watt Linebacker bass head. I was useing it with my 4 track today. Well I usually just plug the head into the 4 track useing the line out jack. Then I noticed this other jack near the speaker jacks, and its has D.I over it. I didn't know what it was used for. So I plugged it into the 4 track to test it, and it send a sound to it. So is the D.I some other type of Line Out Jack? Would I use it, or my line out while recording?