The Yamaha MO-XF and the Roland FA workstations can do that. For as state of the art as the Genos is supposed to be, it would not surprise me that it can do it too. Believe it or not, the Casio CTK/WK-7XXX workstations have been able to do that for several years, and I think the later Motifs and Fantoms were able to do it as well. The Yamahas and Rolands just do it a little slicker than the Casio's do. It's just a looping pattern sequencer. You preset the number of bars to be looped, play your pattenr, and at the end of the loop, the sequencer automatically exits record mode and goes into looping playback mode that you can just start playing along with, but one track is about all you can handle though. Trying to re-enter record mode and switching tracks and voices without missing a beat is pretty tuff, but I think the MO-XF's and FA's make that a little easier too. OR - It could be that he is just using a chord sequencer like Roland introduced on the G-800 or G-1000 arranger workstations in the early 90's and I think carried over into the G-70 line. I think Korg and some of the others had them too. It works similar to what I described above, but you do it with a chord progression in the auto accompaniment. Maybe Genos has brought back chord sequencer operation.