Hi
I got a Roland Cube 60XL Bass amp for my Little Phatty Tribute and I must say it’s fantastic (the amp, LP too 
It has a built in looper and a Solo channel (instant parameter recall) and amp simpulator and more, cool.
I always wanted a looper and I’m starting to play with it.
I’ve come up with a short improvised track I wanted to share. It’s not error free (it’s get’s better after 1:45), but I think it’s fun so I’ll post it.
I’ve plugged an iPhone into the Aux input to provide rhythm (the quality sux) and managed to play a bassline and then pad through a looper perfectly in sync to the drums, then I swithed to Solo channel where I had reverb and delay set up (everything is operated via footpedals - great!) and played a little jam which I recorded via line out of the amp into Logic.
Enjoy.