May be go here
http://www.casiomusicforums.com/index.php?/files/
http://www.casio-europe.com/euro/emi/rhythmsspecial/
http://www.casiomusicforums.com/index.php?/topic/4723-share-wkctk-user-tones/page-2#entry19269
May be u shud try the tone editor and edit either 001 or 002 piano into... Attack time(-54) release time(+35) cut off(-14) vib.type(sin) vib depth(00) vib.rate +15 vib delay(+19) touch sense(63) Reverb send(043) cho.send(001) Mod setting(Vib) (mod depth(064) DSP(off)