i run the PX5S as a primary Master and the K2000 as Slave....but i also use some DAW modules,....like drummer and Seq....only is to programm the K2000R wich is impossible since the handbook is like a telephone book i use Midiquest ,,,for now,,,,i think the power of the K2000R was never used in all these Years just the possibility of routing everything and modulating everything with everything is crazy ,,adding the >FUN`S thigs goes out of understanding what´s happen ......of course Sound is Vintage but try some Moog Bass and the Boxes are blowing away ... the funny is lot of the future inside makes me think Casio did stole some ideas there ! ,,,and samples who know the flute is 1:1 .....for my ears.. Funny i forgot Mike was long time @ Kurzweil The samples in the K2500 Piano ROM daughterboard are from the same source piano as the PC88 which makes them sound similar. The K2500 Piano ROM was recorded in stereo instead of mono, it also contains longer samples and more samples per octave. The K2500's VAST engine is also a huge factor in how musical, expressive and versatile the K2500 Piano ROM is compared to the PC88. -- Mike Martin - Kurzweil"