I use my iPad as an insert effect on the VOX and GTR channels in my mixer routing (using an iConnectivity Audio 4+ as audio interface with inputs and outputs matched to emulate insert effects)
Next to a bunch of insert effects per channel on AUM, I have an instance of Enso (the looper app) on each channel at the end of the chain.
A Midi Fighter Twister controls all the key functions of each Enso instance + Wet/Dry controls of the effects in ther respective chains.
So effectively I have a looper with integrated multi-FX with as many tracks as I may need or want, instant overdub + all the other advanced looper features Enso has to offer. And of course the whole thing is midi sync’ed (as slave to my OT).
The degree of flexibility the iPad gives me to build my own looper device by chaining up AUv3 plugins has satisfied the itch better than any looper pedal I’ve owned so far.