I’m not much of a looper, but I will say the looper you choose must be able to sync with a clock. I was originally trying to use the Ditto X4 looper which synced to the BB using a midi cable. It worked really well, but found that I just don’t do enough looping to use all of the features of the X4. So I’ve now switched to the Ditto Jam X2 which syncs using an external mic to listen for drums. However, I’ve got it setup that I plug the headphone jack of the BB into the Jam X2 instead of using the mic on the pedal. Seems to work well… I just don’t practice looping enough. There are probably other user setups on here that are way more advanced than what I’m using… best of luck.