I have tried adding more outputs (both mono and stereo) but studio one will not allow me to add more. The Us-1800 has 2 moitor outs and 4 line outs in two stereo pairs. So i should be able to have 1 stereo main out and 4 aux sends for mono monitor mixes. But only 4 outputs show up and one pair is locked as a main stereo out. Is there a way i can get it to detect the missing outputs ?