Since I am at best an amateur at this I have a few questions. First off, what can I use the 4 TRS line channels for with pre amps? can I only use those for like directing piano or guitar? or can I use a preamp to with an actual microphone? I know that probably sounds dumb, but hopefully you will understand what i am saying. Do most people use the 8 channel ADAT pre amp channels for the drum tracks? I heard that that is the way to go, cause it gives the drums an even sound all the way around, since they are using the same pre amps. is that the case? Ignore my laymans terms and sounding dumb. The last question I had, was what do you mean by syncing 3 units digitally? I'm not familiar with what that means. thanks