You sure can via a midi sequencing program. I have a PSR740 and an MZ2000 and they work great intandem with Yamaha's xg works software, which I paid about 80 bucks for. With the xg works u can not only perform the standard midi note writing and editing functions, but You can also use the onboard yamaha styles in the sequencer and step sequence the style types and chord cahnges. You can also obtain converted styles from the net and load them into the xg works software as well easily by simply placing these styles into the style folders in the software. works great. Also, via the xg editor you can alter or synthesize any of the internal sounds in a non destructive ( dosen't permanently change )mode.
Al M