Depends on the context. In my main band, Eleven Eyes, I loop on exactly one tune, I use a DL-4 to set up a keyboard loop for the intro of a tune, I mostly use the DL-4 for delays, I love the filtered tape echo patch! It's a six piece band, with horns, turntables, guitar and drums, and I mostly play bass, and it's just such a dense sound that I don't see the need for more clones of me in the mix. Our DJ does a lot of looping of his turntables, and also plays back sampled loops. In my infrequent duo/trio gigs, I do a lot of looping, using a Repeater and a JamMan, with a Lexicon Vortex in the FX loop of the Repeater. The Repeater and JamMan are clocked from either an ER-1 or, lately, an Adrennalinn. There's also a Nord Micromodular playing step-sequenced synth loops. Sound sources are Rhodes, Nord Lead and MiniMoog, maybe a little bass. I've also been considering integrating my laptop, running Reason and Live, into the above setup, possible replacing the Repeater and JamMan.