OK so I am running two ZT Lunchbox amplifiers in stereo off my Tonelab ST. but on the back of the unit there is the 4 way switch. for Vox, fender, and marshal quad style amps, and a Line out switch. my Lunchbox amps are simple solid state amps with an analogue front end input stage. so what should i be running, he line out setting? when i run it at line out it sounds a little thin, but i can change the settings if thats the right one?