Clearly I am couple years late to the party but perhaps to help future ‘searchers’ through the forum, I found where I place the looper is important.
To use the looper to adjust presets - record yourself and continually playback while adjusting parameters until desired effect - you place the looper FIRST in the chain.
To record one snapshot, say rhythm, and playback with the same parameters and blocks as recorded, and play over it under a different snapshot, say lead, place the looper LAST.