Let's say you have a three amp rig. How would you loop? In a one amp system you could use a dumbleator clone, but what do do in a three amp rig if the amps just have a passive effects loop (not buffered).

In a one amp rig I know you would run the rackmount stuff in a loop, but would you also run the delay.reverb/chorus/phase/flaning pedals in the loop too?