don't want to burst any bubbles here, but i suspect that yamaha are providing the same four arpeggiators that are going to be on the new XS line...(there is only a single one on the ES)...what these do is play arpeggio patterns that either come with the unit or are programmed by the user,its not clear yet whether the mini mo will allow user edits of arps...if they are anything like the arps in the current line they are good, but can be fiddly to change from one arp to the next, and in the 1700 odd arps that came with my ES there are NO intros or endings.... all the arps are simply repeating patterns...BUT who knows maybe yamaha have added some chord recognition as well...all will be revealed at NAMM i guess....6 days to go...i also imagine they will be announcing the PSR S-900 as well, which is supposed to be to the tyros 2, what the psr3000 was to the tyros...anyhoo
cya
dennis