ok got a quick question about the loops on the TC electronics G system.

so i can hook the whole unit up with a 4CM to my amp? if i throw a tubescreamer in the loop can i make it go before the amp as a boost? and the loops are assignable to channels? (like its on for some presets and off for others)

my purpose for this is to have it on to boost the lead channel of my amp but then off for the clean channel so the clean channel is actually clean, and so im not tap dancing