Eventide Harmonizers are expensive, but they do a lot besides looping. The unit can be ordered either with 23.8 seconds mono (11.7 seconds stereo) or 95 seconds mono (47.5 seconds stereo) sampling time. An internal sampler board has to be ordered for the H3000, the H3500 comes with the sampling hardware standard. Pitch shifting and time expansion functions are available for the loops. There appears to be editing of loop start and stop points and loop triggering available as well. It's not clear how usable it is for real-time looping or if there are anything other than basic looping functions