i have further to add, i have a roland DS88, the DS88 has 4 partials for each of its 16 parts [ yes it does have 16 parts though its very long winded to set iut up - but i dont believe that you can assighn any of the upper/lower sliders to any other part] but the point is this if you ristrict you partials to 1&2 and 3&4 [ ie no ring modulater useage ] ie as most people would as a 4 oscerlater synth. then each partial itself can be split/layered as you wish, so if you only want for eg 1 piano partial, 1 organ partial , 1 bass partial , and 1 solo partial then you can split/ layer these anyway you wish , as well as the normal 16 parts split/layered any way you wish, ie for a total of 64 split/layers any way you wish. at least this appears to be how its architected ? . hope this helpeds. this doesnt seem to be made obvios in the youtube videoes. this is also the case for the juno stage, and juno DI [ upgraded to the DS88 but wish thered kept the MIDI file player as on the DI & stage, the new implimentation is crap as i dont play samples i only play compleatly live. also i have no use of the axial upgrade as it uses up patch memory and id rarther make up my own patches. i still have my juno stage which all this can be done on the front panel, on the juno DI you have to use the [ included softwear editor ] dont know why know one else knows this. also though the ax-synth [ also have one as well ] also says not multitimblal, again it has 4 partials which can be split/layered any way you wish, again no one seems to know this ! but most if not all roland keyboards have this fearture, though i believe , not sure but think the jupitor 80 only has 3 partials but would have to check on that. cheers