A. Usually I put all my effects in line, the looper is last before the amp. You craft your sound and you hit record on the looper. Then, you let play the recorded loop and you play your thing over it, all the effects you choose after that don’t affect the recorded loop, because they are before.

B. Alternatively, wich is also fun, you put the looper somewhere in between the other effects (reverb and delay AFTER loop by example)… in this case the FX past the looper will affect the recorded loop AND the stuff you play over it.

I made a box wich swith my looper in the chain. This way I can flip a switch and do A or B without playing with wires…

Hope it makes sense